Siege of Acre (1291)

The siege of Acre (also called the fall of Acre) took place in 1291 and resulted in the Crusaders losing control of Acre to the Mamluks. It is considered one of the most important battles of the period. Although the crusading movement continued for several more centuries, the capture of the city marked the end of further crusades to the Levant. When Acre fell, the Crusaders lost their last major stronghold of the Crusader Kingdom of Jerusalem. They still maintained a fortress at the northern city of Tartus (today in north-western Syria), engaged in some coastal raids, and attempted an incursion from the tiny island of Ruad, but when they lost that as well in 1302 in the siege of Ruad, the Crusaders no longer controlled any part of the Holy Land.[4]

This article is about the Siege of Acre (1291). For other sieges, see Siege of Acre.

Siege of Acre (1291)
Part of The Crusades

Matthieu de Clermont défend Ptolémaïs en 1291, by Dominique Papety (1815–49) at Salles des Croisades in Versailles
Date4 April – 18 May 1291
Location
Acre, Kingdom of Jerusalem
32°56′N 35°05′E
Result

Decisive Mamluk victory

End of the Levant Crusades
Territorial
changes		 Acre captured by the Mamluks
Belligerents

Mamluk Sultanate
Commanders and leaders
  • Eşrefbay
  • Halilbay
  • Hüsambay
  • Laçinbay
  • Barsbay
  • Mansurbay
  • Seyfibay
  • Bilbay
  • Banbay
 (DOW)
Strength
Unknown

Acre: 15,000[1]

Cyprus: 700[2]
Casualties and losses
Unknown 10,000+[3]

Background

In 1187, Saladin conquered much of the Kingdom of Jerusalem (also called the Latin Kingdom), including Acre and Jerusalem, after winning the Battle of Hattin and inflicting heavy losses on the Crusaders. The Third Crusade was launched in response; the Crusaders besieged and eventually recaptured Acre in 1191. Acre became the capital of the Kingdom of Jerusalem. The religious orders made their headquarters in and around the city, and from there made crucial military and diplomatic decisions. For example, when the Mongols arrived from the East in the mid-13th century, the Christians saw them as potential allies while also maintaining a cautious neutrality with the Muslim Mamluks. In 1260, the Barons of Acre granted the Mamluks safe passage through the Latin Kingdom en route to fighting the Mongols; the Mamluks subsequently won the pivotal Battle of Ain Jalut in Galilee against the Mongols. This was an example of atypically cordial relations between the Christians and the Mamluks.[5]

In 1250, the Mamluk Sultanate arose in Egypt; it was a more dangerous enemy than the Ayyubids. The Mamluks fielded heavy cavalry – a match for the Crusader knights – and were much more hostile. As early as 1261, after the Battle of Ain Jalut, Sultan Baibars led the Mamluks against the Crusaders. Baibars captured Caesarea, Haifa, and Arsuf in 1265, all the important Crusader holdings in Galilee the following year, and then Antioch in 1268.[6]

Europe launched a number of minor Crusading expeditions to reinforce the Crusader states, including the abortive Crusade of Louis IX of France to Tunis in 1270, and the minor Ninth Crusade of Prince Edward (later King Edward I) of England in 1271–1272. The expeditions failed to provide the required relief; they were too small, too short-lived, and the interests of the participants were too diverse.[7]

The fall of Tripoli in 1289 triggered frantic preparations to save Acre.

More seriously, no major reinforcing Crusade was forthcoming. Pope Gregory X was unable to rally support for another great Crusade. Papal advisors blamed the lack of enthusiasm to the laziness and vice of the European nobility and to clerical corruption. A more fundamental reason seems to have been the debasement of the Crusading ideal; Gregory X's predecessors had used Crusades to raise armies against the Papacy's European enemies.[8]

The Crusader states continued to deteriorate from continuing attacks and political instability. In 1276, the unpopular "King of Jerusalem" Hugh III moved his court to Cyprus.[9] Under Sultan Al-Mansur Qalawun, the Mamluks captured Lattakia in 1278, and conquered the County of Tripoli in 1289. Qalawun concluded a ten-year truce with the Kingdom of Jerusalem in 1284.[10]

Following the fall of Tripoli, King Henry II, son of Hugh III, sent seneschal Jean de Grailly to warn European monarchs of the critical situation in the Levant.[11] Pope Nicholas IV supported Jean by writing letters urging European potentates to act. However, the Sicilian question overshadowed calls for a new Crusade, and Edward I of England was too entangled by troubles at home.[12]

Decades of communications between the Europeans and the Mongols failed to secure a meaningful Franco-Mongol alliance.[13][14]

Pretext for attack

One Arabian account claims that an affair between a rich young wife of the city and a Mussulman was discovered by the husband who:

gathers together some friends goes out from Ptolemais [...] and immolates them both to his injured honour. Some Mussulmans are drawn to the spot, the Christians come up in still greater numbers, the quarrel becomes angry and general and every Mussulman is massacred.

— The History of the Crusades, Vol. 3, p. 73, Michaud and Robson[15]

The Crusaders feared that Qalawun would use this as a pretext to resume the war, and petitioned the pontiff for reinforcements. According to Michaud, 25 Venetian galleys carrying 1600 men "levied in haste in Italy" were sent.[15] Other sources claim 20 galleys of peasants and unemployed townfolks from Tuscany and Lombardy, led by Nicholas Tiepolo, the son of Doge Lorenzo Tiepolo, who was assisted by the returning Jean de Grailly and Roux of Sully. These were joined by five galleys from King James II of Aragon who wished to help despite his conflict with the Pope and Venice.[16]

The Italian reinforcements were ill-disciplined and without regular pay; they pillaged indiscriminately from both Muslims and Christians before setting out from Acre. According to Runciman they attacked and killed some Muslim merchants around Acre in August 1290,[11] although in Michaud's account they instead pillaged and massacred towns and villages. Qalawun demanded the extradition of the Christian perpetrators. On the suggestion of Guillaume de Beaujeu, the Grand Master of the Knights Templar, the Council of Acre debated the issue; the Sultan's demand was rejected, with the Crusaders claiming that the murdered Muslims had been responsible for their own deaths.[17]

Siege

Prelude to battle

Sultan Qalawun dissolved the truce with Acre and the Mamluks began mobilizing by October 1290. Qalawun died in December and was succeeded by his son, Al-Ashraf Khalil[18] (sometimes spelled Chalil.[15]) Guillaume de Beaujeu received a message from Khalil, which stated the latter's intention to attack Acre and to refuse peace overtures.[19] Nonetheless, the Crusaders dispatched a peace delegation, led by Sir Philip Mainebeuf,[20][21] to Cairo; the delegation was imprisoned.[22][20] Khalil set out from Cairo in March 1291.[18]

The assembled Mamluk army greatly outnumbered the Crusaders. Khalil called upon Syria to reinforce his Egyptian army;[1] he was answered by contingents from Damascus (led by Lajin), Hama (led by al-Muzaffar Taqai ad-Din), Tripoli (led by Bilban) and Al-Karak (led by Baibars al-Dewadar.)[23][24] A significant portion of the troops were volunteers.[25] The army included a substantial artillery train[1] drawn from fortresses across the Mamluk empire. Hama sent the enormous catapult "The Victorious"[18] (المنصورى, Al-Mansuri.)[nb 1] Another large catapult was "The Furious" (الغاضبة, Al-Ghadibah.) There were also lighter mangonels called "Black Bulls" (الثيران السوداء, Al-Thiran Al-Sawda'a.).[26]

Notable historians in the Mamluks ranks included Baibars al-Dewadar,[27] and Abu al-Fida in the Haman contingent.[28]

The Crusaders appeals for aid met with little success. England sent a few knights, including Otto de Grandson of Savoy. The only noteworthy reinforcements came from Henry II of Cyprus, who fortified the walls and sent troops led by his brother Amalric. Burchard von Schwanden suddenly resigned as Grand Master of the Teutonic Order and left Acre for Europe; he was succeeded by Konrad von Feuchtwangen. The only major contingent to leave were the Genoese, who concluded a separate treaty with Khalil. Many women and children were evacuated from Acre to Cyprus in March.[18]

Acre was defended by an inner and outer wall, with a total of twelve towers built by European kings and rich pilgrims.[29][30][31]

Siege begins
Map of Acre in 1291

Sultan Khalil and the Egyptian army arrived at Acre on 6 April 1291,[1][18] with the Syrian contingents arriving two days later with siege engines. The Mamluk encampment spanned from one coast to the other about two kilometres from the city walls. The red dihliz – the Sultan's personal tent and headquarters – was on a small hill west of the Legate's Tower. There was little fighting during the first eight days as the besiegers established their camp. From days nine to eleven the Mamluks pushed forward barricades and wicker screens until they reached the fosse before the outer wall; Carabohas, rapid-fire siege engines, were brought up. The besiegers began mining and bombarding the walls.[1] Acre's gates remained open – but heavily defended – as sally ports.[1]

The Crusaders launched multiple attacks on the Mamluk camp. An amphibious assault on the Hamans – stationed on the northernmost section of the line by the sea – was successful although the Crusaders suffered heavy casualties.[1] In another raid, three hundred Templar, led by Jean de Grailly and Otto de Grandson, rode out under moonlight to attack Haman artillery with Greek fire; while the artillery was not destroyed, the Templar engaged over 1000 Mamluks and returned with trophies and captured supplies. Khalil punished some subordinates for the humiliation caused by the Templar. In general, Crusader attacks failed to disrupt Mamluk preparations for a direct assault on the walls.[32]

Henry II of Cyprus arrived on 4 May with reinforcements[32][18] of 700 troops aboard 40 ships.[2] The king's arrival temporarily buoyed morale, but an inspection of the city convinced Henry II to attempt a negotiated settlement; the Crusaders believed that tribute could buy a truce. On 17 May, William of Villiers, a knight, and William of Caffran, of Guillaume de Beaujeu's household, were sent to negotiate with the Sultan. The negotiations were unsuccessful. The Crusaders refused to surrender, and appealed to Khalil to lift the siege and accept peace for the sake of the civilian inhabitants. Khalil remained intent on conquering the city, perhaps encouraged by the popularity of the cause among his troops; his counteroffer to allow the defenders to surrender and leave with their lives and property was rejected. Toward the end of the meeting, a Crusader artillery stone landed near the dihliz; the Sultan was greatly angered and ordered a full assault the following day. The messengers returned to the city unharmed.[32]

The Mamluk assault was preceded by weeks of preparation. By 18 May, multiple towers and parts of the wall were collapsed by undermining, and sections of the fosse filled in. The collapse of the Tower of the King was particularly demoralizing among the defenders, and the evacuation of women and children accelerated.[32]

Storming the city
14th-century illustration of the siege in the Grandes Chroniques de France, depicting the Mamluks undermining the city walls

The Mamluk army assembled before dawn on 18 May[32] and attacked the entire length of the wall to the sound of trumpets and drums carried on 300 camels.[33][34] The Mamluks poured through the breaches; by 9 a.m. the outcome seems to have been beyond doubt.[35] The Mamluks captured the Accursed Tower on the inner wall[36] and forced the Crusaders to retreat to the Gate of St. Anthony.[37] Guillaume de Beaujeu was mortally wounded defending the Gate of St. Anthony.[nb 2][32] On the Montmusard walls, the Lazarists remained while the Templars and Hospitallers[38] made a failed attempt to retake the Accursed Tower.[37] The redeployment allowed the Hamans to break through the Montmusard walls and kill the Lazarists. The Mamluks gained more penetrations as the Crusaders abandoned the walls.[38]

The Mamluks pushed into the city, looting[38] and massacring any they encountered.[35][nb 3] Organized Crusader resistance collapsed, and the retreat to the harbour and the ships was chaotic;[35][38] wealthy refugees offered exorbitant sums for safe passage.[nb 4][nb 5] Henry II and Jean de Villiers, Grand Master of the Knights Hospitaller, were among those evacuated. The evacuation was made more difficult by the poor weather.[35]

Acre falls
Image of siege of Acre
The city of Acre fell in 1291, and its Latin Christian population was killed or enslaved.

By the night of 18 May,[41] Acre was in Mamluk hands, except for the seaside Templar fortress at the western tip of the city.[35] The fortress contained four towers, and within were remnants of the Templar, Hospitallers, and Teutonic Knights, and thousands of civilians.[42][43] The fortress held out for ten more days, during which Matthew of Clermont, a Hospitaller marshal, was killed.[35] Templar Thibaud Gaudin and a few others left the fortress under the cover of darkness, taking the Templar treasury with them to Sidon.[nb 6][43] On 20 May, the tower held by the Templars, led by Peter de Severy, asked for amnesty.[42] Sultan Khalil agreed to allow the woman and children to leave the city. The gates were opened and 400 horseman entered the complex, but they immediately attacked the women and children. Peter de Severy refused to accept this and ordered the gates to be closed, trapping the horsemen. [44] A battle ensued, but this time the Christians had the advantage. Of the 400 horsemen who entered the fortress, only a handful escaped. [45] The others were either killed or beheaded. The battles were fierce and relentless. This wasn't just the last stand at Acre, it was the last stand of the crusader states.[46] When the fighting stopped, Peter de Severy received another letter from the Sultan. In it, he stated that his men deserved their deaths for their undisciplined behavior. Furthermore, he asked the marshal to leave his fortress to discuss terms. It was a lie. Trying to spare the civilian population under his protection, Peter de Severy opened the gates and stepped forward with a delegation of Knights Templar. Before they could reach the enemy's encampments they were killed by the Sultan's troops.[47] Further offers of amnesty were rejected by the Crusaders. On 28 May, the final tower surrendered; Mamluk mines were prepared to destroy the tower making further resistance useless. The tower collapsed after prisoners and booty had been removed; according to Mamluk accounts, a few sightseers and looters were killed.[43][nb 7]

News of the Mamluk victory caused celebrations in Damascus and Cairo. In Damascus, Khalil entered the city with chained Crusader prisoners and captured Crusader standards – carried upside-down in defeat. The Sultan returned to Cairo with the gate of the Church of Saint Andrew from Acre, which was used to construct a mosque[49] and released Philip Mainebeuf's delegation.[50] Furthermore, celebrations were described as: “The entire city had been decorated, and sheets of satin had been laid along his triumphal path through the city leading to the palace of the governor. The regal sultan was proceeded by 280 fettered prisoners. One bore a reversed Frankish banner; another carried a banner and spear from which the hair of slain comrades was suspended. Al-Ashraf was greeted by the whole population of Damascus and the surrounding countryside lining the route, ulama [legal scholars], mosque officials, Sufi sheiks, Christians and Jews, all holding candles even though the parade took place before noon.”[51]

Aftermath
See also: Fall of Ruad

The fall of Acre signaled the end of the Jerusalem crusades. No effective crusade was raised to recapture the Holy Land afterwards, though talk of further crusades was common enough. By 1291, other ideals had captured the interest and enthusiasm of the monarchs and nobility of Europe and even strenuous papal efforts to raise expeditions to retake the Holy Land met with little response.

The Latin Kingdom continued to exist, theoretically, on the island of Cyprus. There the Latin kings planned to recapture the mainland, but in vain. Money, men, and the will to do the task were all lacking. One last effort was made by King Peter I in 1365, when he successfully landed in Egypt and sacked Alexandria. Once the city was taken, however, the Crusaders returned to Cyprus. As a crusade, the episode was futile, and this and further coastal raids over the following decades led in 1410–11 to a destructive counter-raid by the Mamelukes; in 1426 Cyprus was forced into Mameluke vassalship with a hefty yearly tribute.

The 14th century saw some other crusades organized such as the Crusade of Nicopolis, but these enterprises differed in many ways from the 11th- and 12th-century expeditions which are properly called Crusades. The crusades of the 14th century aimed not at the recapture of Jerusalem and the Christian shrines of the Holy Land, but rather at checking the advance of the Ottoman Turks into Europe. While many of the crusaders in these 14th-century undertakings looked upon the defeat of the Ottomans as a preliminary to the ultimate recapture of the Holy Land, none of the later crusades attempted any direct attack upon Palestine or Syria.

Historiography

Two short works dedicated to the siege were produced by contemporaries on the basis of eyewitness accounts: the Hystoria de desolacione of Thaddeus of Naples and the anonymous Excidium Acconis. These survive in four and six manuscripts, respectively.[52][53] The Gestes des Chiprois, written a generation later and surviving in a single manuscript, is the other main source from the crusaders' perspective.[52]

Notes
  1. This may have been a reference to the Sultan, who was Khalil Al-Mansuri.
  2. He was buried in the Templar fortress before the fall of the city.[35]
  3. According to Ludolph of Suchem (which seems exaggerated): "In Acre and the other places nearly a hundred and six thousand men were slain or taken, and more than two hundred thousand escaped from thence. Of the Saracens more than three hundred thousand were slain, as is well known even to this day."[39]
  4. Roger de Flor, a mercenary commander and Knight Templar, made his fortune by selling passage to fleeing nobles and blackmailing refugees.[40]
  5. "More than five hundred most noble ladies and maidens, the daughters of kings and princes, came down to the seashore, when the city was about to fall, carrying with them all their jewels and ornaments of gold and precious stones, of priceless value, in their bosoms, and cried aloud, whether there were any sailor there who would take all their jewels and take whichever of them he chose to wife, if only he would take them, even naked, to some safe land or island"[39]
  6. Thibaud Gaudin was elected as Grand Master of the Knights Templar at Sidon.
  7. According to Ludolph of Suchem, the Templars deliberately caused the collapse by undermining the walls.[48]

References
  1. Folda (2005), p. 485
  2. Nicolle (2005), p. 39
  3. Sean McGlynn (18 May 2018). "The Siege of Acre: a monstrous blot on the Third Crusade". The Spectator. Archived from the original on 14 May 2018. Retrieved 17 August 2019.
  4. Burgtorf, Jochen (2006). "Acre, Siege of (1291)". In Alan V. Murray (ed.). The Crusades: An Encyclopedia. Vol. 1. Santa Barbara: ABC-CLIO. pp. 13–14. OCLC 70122512.
  5. "Battle of Ayn Jalut | Summary | Britannica". www.britannica.com.
  6. Folda, Jaroslav (2005). Crusader art in the Holy Land : from the Third Crusade to the fall of Acre, 1187–1291. Cambridge University Press. ISBN 9780521835831.
  7. Newman, Albert Henry, A Manual of Church History, p. 461
  8. Newman, Albert Henry, A Manual of Church History, p. 461
  9. Edbury, Peter W. (1994). The Kingdom of Cyprus and the Crusades, 1191–1374. Cambridge University Press. ISBN 978-0-521-45837-5, pp 90.
  10. Rabbat, Nasser O. (2021). The Citadel of Cairo. Brill. p. 136. ISBN 978-90-04-49248-6.
  11. Runciman (1951), p. 408
  12. Schneidman, J.Lee (December 1969). "Ending the War of the Sicilian Vespers". Journal of Peace Research. 6 (4): 335–347. doi:10.1177/002234336900600404. ISSN 0022-3433. S2CID 110273792.
  13. Atwood. "Western Europe and the Mongol Empire" in Encyclopedia of Mongolia and the Mongol Empire. p. 583. "Despite numerous envoys and the obvious logic of an alliance against mutual enemies, the papacy and the Crusaders never achieved the often-proposed alliance against Islam".
  14. Ryan, James D. (November 1998). "Christian Wives of Mongol Khans: Tartar Queens and Missionary Expectations in Asia". Journal of the Royal Asiatic Society. Cambridge, UK; New York, New York, USA: Cambridge University Press. 8 (3): 411–421. doi:10.1017/S1356186300010506. JSTOR 25183572.
  15. Michaud, The History of the Crusades, Vol. 3, p. 18; available in full at Google Books. Note that in a footnote Michaud claims reliance on "the chronicle of Ibn Ferat" (Michaud, Vol. 3, p. 22) for much of the information he has concerning the Mussulmans.
  16. Runciman (1951), p. 409
  17. Runciman (1951), pp. 410–411
  18. Claster (2009), p. 286
  19. "Because you have been a true man, so we send you advance notice of our intentions, and give you to understand that we are coming into your parts to right the wrongs that have been done. Therefore we do not want the community of Acre to send us any letters or presents (regarding this matter), for we will by no means receive them." —From the letter of Al-Ashraf Khalil to Guillaume de Beaujeu, The Templar of Tyre, Gestes des Chiprois, p. 104 / part 3
  20. The Templar of Tyre, Gestes des Chiprois, p. 104 / part 3
  21. Philip Mainebeuf, who spoke Arabic, was accompanied by a knight named Bartholomew Pisan and a scribe named George. The Templar of Tyre, Gestes des Chiprois, p. 104 / part 3
  22. Asili, p. 110
  23. There are no reliable figures for the Muslim army, according to some sources it consisted of 60 000 cavalry and 160 000 infantry. Though the numbers seem exaggerated, the army of the Muslim was probably larger than that of the Crusaders. Asili, p. 111
  24. Michaud, ibid, pp. 75–76, gives account of 7 emirs leaving in Kalouan's (ie Sultan Qalawun) stead as he was ill; he reports that each emir had 4,000 horse and 20,000-foot at his command – giving about 160,000 men.
  25. Abu al-Fida, p. 278 / vol. 13. According to Ibn Taghri most of Khalil's troops were volunteers. Ibn Taghri, p. 5 / vol. 8
  26. Asili, p. 110; Templar of Tyre, p. 105
  27. Rukn ad-Din Baibars al-Dewadar was also a historian. He gave his account about the battle for Acre in his book "Zobdat al-Fikrah Fi Tarikh al-Hijrah ( 11 volumes )".
  28. Asli, p. 114
  29. Among these towers were the Tower of the Countess of Blois, the Accursed Tower, the Tower of the Legate, the Tower of the Patriarch, the Tower of St. Nicholas, the English Tower, the Germans Tower, the Tower of Henri II, the Tower of King Hugh and the Tower of St. Lazarus. Asili, p. 113; Templar of Tyre, p. 106 / note2
  30. The English tower was built by Henry I. Asili, p. 113
  31. The Tower of the Countess of Blois was built by the Countess of Blois. Asili, p. 114
  32. Folda (2005), p. 486
  33. Al-Maqrizi, p. 223 / vol. 2; Asili, p. 118
  34. Michaud, ibid, p. 78
  35. Folda (2005), p. 487
  36. The Accursed Tower was placed between the Tower of King Henri II and the Tower of the Teutonic Knights. Templar of Tyre, p. 106; Asili, p. 113
  37. Templar of Tyre, p. 113
  38. Crowley, Roger (2019). The Accursed Tower: The Fall of Acre and the End of the Crusades. New York, NY: Hachette Book Group INC. p. 216.
  39. Ludolph of Suchem, pp. 268-272
  40. Asili, pp. 120-121
  41. Templar of Tyre, p. 104
  42. Bird, Jessalynn; Peters, Edward; Powell, James M., eds. (2013). Crusade and Christendom: Annotated Documents in Translation from Innocent III to the Fall of Acre, 1187–1291. The Middle Ages Series. University of Pennsylvania Press. pp. 489–491. ISBN 978-0-8122-4478-6.
  43. Crowley, Roger (2019). The Accursed Tower: The Fall of Acre and the End of the Crusades. New York, NY: Hachette Book Group INC.
  44. Jones, Dan (2017). The Templars: The Rise and Spectacular Fall of God's Holy Warriors. London: Head Of Zeus. p. 334. ISBN 0525428305.
  45. Jones, Dan (2017). The Templars: The Rise and Spectacular Fall of God's Holy Warriors. London: Head Of Zeus. p. 334. ISBN 0525428305.
  46. Jones, Dan (2017). The Templars: The Rise and Spectacular Fall of God's Holy Warriors. London: Head Of Zeus. p. 334. ISBN 0525428305.
  47. Jones, Dan (2017). The Templars: The Rise and Spectacular Fall of God's Holy Warriors. London: Head Of Zeus. p. 334. ISBN 0525428305.
  48. Ludolphi, Rectoris Ecclesiæ Parochialis in suchem, p. 46
  49. Asili, p. 123
  50. Ibn Taghri, p. 9 / vol. 8
  51. Nicolle, David (2005). Acre 1291: Bloody Sunset of the Crusade. Oxford, UK: Osprey Publishing. p. 87.
  52. Edgington 2006a.
  53. Edgington 2006b.

Bibliography
  • Asili, B. (1992). Al-Zahir Baibars and the End of the Old Crusades. Beirut: Dar Alnafaes.
  • Claster, Jill N. (2009). Sacred Violence: The European Crusades to the Middle East, 1095–1396. University of Toronto Press. ISBN 9781442604308.
  • Crowley, Roger (2019). The Accursed Tower: The Fall of Acre and the End of the Crusades. Basic Books. ISBN 978-1541697348.
  • Edgington, Susan B. (2006). "Excidium Acconis". In Alan V. Murray (ed.). The Crusades: An Encyclopedia. Vol. 2. ABC-CLIO. p. 448.
  • Edgington, Susan B. (2006). "Thaddeus of Naples". In Alan V. Murray (ed.). The Crusades: An Encyclopedia. Vol. 4. ABC-CLIO. p. 1169.
  • Folda, Jaroslav (2005). Crusader Art in the Holy Land, From the Third Crusade to the Fall of Acre. Cambridge University Press. ISBN 9780521835831.
  • Hosler, John D. (2018). The Siege of Acre, 1189-1191: Saladin, Richard the Lionheart, and the Battle That Decided the Third Crusade. New Haven: Yale University Press. ISBN 978-0-300-21550-2.
  • Nicolle, David (2005). Acre 1291: Bloody sunset of the Crusader states. Osprey Publishing.
  • Runciman, Steven (1951). A History of the Crusades. Cambridge University Press.
  • The 'Templar of Tyre': Part III of the 'Deeds of the Cypriots'. Translated by Crawford, Paul. Ashgate. 2003. ISBN 9781840146189.
  • Jones, D. (2017). The Templars: The Rise and Spectacular Fall of God's Holy Warriors. London, UK: Head Of Zeus. p. 334.

Further reading
  • Antonio Musarra, Acri 1291. La caduta degli stati crociati, Bologna, il Mulino, 2017.
  • Siege of Acre 1291
  • The history of the crusades, Volume 3, pp 70–89 (Google Books, full view), by Joseph François Michaud, trans. William Robson. Note that in this account Acre is referred to as "Ptolemaïs", Sultan Qalawun as "Kalouan" and Khalil as "Chalil" and throughout the work Muslims are referred to as "Mussulmans". Several contemporary manuscripts, such as the chronicles of Ibn Ferat, are referenced and appendices give some translations.
  • The Crusades by Edward Gibbon (1963), pp. 76–78, provides a useful short summary of the events of the siege including an overview of the situation in Acre at the time.
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