Arnold II of Isenburg

St Lubentius, Dietkirchen, Limburg

Arnold was born c. 1190. His father was Bruno I of Isenburg-Braunsberg and his mother was Theodora von Wied, the sister of Theoderich von Wied,[1][2] who was Archbishop of Trier 1212–1242.[3] His cousin was Siegfried III, archbishop of Mainz; another likely relative was Konrad von Hochstaden, archbishop of Cologne.[1] Arnold was likely educated at the cathedral school in Cologne and spoke Italian.[1] Before c. 1210, he became a member of the cathedral chapter in Trier, where he was cellarer from 1212. Arnold became archdeacon of St. Lubentius in Dietkirchen in 1217 and cathedral provost in 1228.[4][1] The provostship at the cathedral, the second highest position in the diocese after the episcopal seat,[5] had become vacant upon the death of Rudolf de Ponte (senior); Arnold's main competitor for this position was another member of the de Ponte family, also called Rudolf, who was given the provostship of St Paulin instead in order to ascertain Arnold's election.[6] Before 1220, he became provost of St Gangolf (Mainz);[7] from 1236, he was provost of St Mary at Erfurt and of St Castor in Koblenz.[4]

In 1242, the Hohenstaufen king Conrad IV of Germany, son of Emperor Frederick II, Holy Roman Emperor, visited Trier during Lent. At this time, the archbishops of Mainz and Cologne were no longer loyal to the Hohenstaufen dynasty, but Theoderich of Wied still supported the Emperor. When a soldier attempted to seize Siegfried von Honeck, a supporter of the archbishop of Mainz, in Arnold's house, Honeck killed the soldier. A tumult ensued, and Arnold retreated into the episcopal palace.[8] Theoderich died on 28 March 1242 and Arnold was elected as his successor by the cathedral chapter. This was the first episcopal election in Trier where only the cathedral chapter could vote, in contrast to previous elections where other nobility and clerics had been involved.[1] Parties opposed to Arnold chose the St Paulin provost, Rudolf de Ponte, as the new archbishop. Conrad then granted the regalia to Rudolf.[8][9] After a short civil war,[2][9] in which some counts and dukes including Henry V, Count of Luxembourg fought against Arnold,[10] Rudolf gave up his claim and settled for his previous provostship.[11] He died soon after, which ended the conflict.[1] Pope Innocent IV confirmed Arnold as archbishop in 1245,[4] and Arnold was consecrated as bishop in June 1245 by the archbishops of Mainz and of Cologne together with Roger de Mercy, the bishop of Toul.[1]

Trier Cathedral

Together with his colleagues from Cologne and Mainz, Arnold elected Henry Raspe as anti-king of Germany on 22 May 1246.[9][1] After Henry's death, the archbishops elected William II of Holland as his successor in 1247.[12] Arnold supported William from 1249, allowing him the use of his fortress at Ehrenbreitstein.[12] He was with William's armies at Mainz in a confrontation with Conrad IV in 1250, and accompanied him to see Pope Innocent IV in Lyon at Easter 1251.[9][12]

In the 1257 Imperial election, Arnold elected Alfonso X of Castile, while the other archbishops elected Richard of Cornwall. This also led to military conflict with the Archbishop of Mainz, Gerhard I. von Dhaun, with the Trier troops defeated by Mainz at Boppard in May 1257.[9][12]

During his reign, Arnold tried to increase the power of the archbishop, and built fortifications at Trier,[12] Münstermaifeld, Koblenz and Hartenfels as well as castles including Bischofstein Castle and Stolzenfels Castle.[4] His favourite residence was at Ehrenbreitstein.[4] Arnold's methods for financing his activities, which included tolls and credits,[4] but also withheld money from other clerics, as well as the lack of diocesanal synods under his reign led to criticism by the cathedral chapter and other influential Trier clerics, who wrote an open letter that was publicly read in the cathedral on 10 February 1257.[9]

During Arnold's tenure, only one excommunication is documented, unlike the frequent use of excommunication under his predecessor.[13] The Liebfrauenkirche and St. Maximin's Abbey were completed during his reign. Arnold died in Montabaur in early November 1259 and is buried in Trier Cathedral, opposite of his predecessor.[4][14]