Ernest, Count of Isenburg-Grenzau

Count Ernst von Isenburg-Grenzau (born 1584, died May 30, 1664, in Brussels) was a Spanish general in the Thirty Years' War and the last representative of the Isenburg-Grenzau line.[1]

Ernst Graf von Insenburg
Born1584
Brussels, Spanish Netherlands
Died1664
Brussels, Spanish Netherlands
Buried
Cathedral of St. Michael and St. Gudula
AllegianceSpanish Empire
Battles/warsBattle of Rocroi

Origin

His parents were Salentin IX of Isenburg-Grenzau (1532-1610) and his wife Countess Antonie Wilhelmine von Arenberg (born March 1, 1557, died February 26, 1626), steward of the Infanta Isabella and sister of Karl von Arenberg. Salentin had been elected Archbishop and Elector of Cologne, but resigned after 10 years to prevent his line from dying out. Ernst also had an older brother named Salentin, who fell in imperial military service on December 5, 1619.[2]

Life

He went into Spanish service by 1614 at the latest and fought under Spinola in the Palatinate and the Netherlands. After the Eighty Years' War broke out again, he took part in the siege of Jülich (1621–1622). During the siege of Breda in 1625 he commanded one of the four camps near the city.[3] He is also shown behind Spinola in the well-known picture by Velasquez. In 1628 he received the Order of the Golden Fleece from king Philip IV.

At the beginning of 1633, as general of artillery, he led an advance in support of the Elector of Cologne, Ferdinand, against the Swedes. He captured Nonnenwerth, Olbrück Castle, Saffenburg Castle and Landskron Castle on the Rhine and along the Ahr. When the Swedes under Baudissin took Hammerstein Castle in return and attacked Remagen, Isenburg moved towards them and pushed them back.[4] In mid-March, however, he had to lift the siege of Andernach and retreat across the Rhine in the direction of Linz am Rhein before the Swedish relief army led by Baudissin's successor, Christian I, Count Palatine of Birkenfeld-Bischweiler.[5]

In 1636 the king appointed him governor and governor-general of the provinces of Namur and Artois. In August of that year he took the border town of Hirson. In 1638 he took part in the successful relief of the besieged St. Omer under Prince Thomas of Savoy and Ottavio Piccolomini. In 1643 he besieged the fortress of Rocroi on the French border. Francisco de Melo wanted to come to his aid, but then met a relief army under Louis de Bourbon. It came to the Battle of Rocroi, which ended in a heavy Spanish defeat. Isenburg survived the battle but retired from military life afterwards. He succeeded Count von Fontaine as Generalfeldmeister of the Flemish army, since he fell in battle. On 29 September 1645 he was also appointed head of finances (grand treasurer) of the Netherlands, the tax administration of the king of Spain. Isenburg lived in Brussels, where he also died, his county was looked after by administrators.

His tomb is in the Cathedral of St. Michael and St. Gudula.[6]

References
  1. admin. "Isenburg und Grenzau, Ernst I. Graf von | Der Dreißigjährige Krieg in Selbstzeugnissen, Chroniken und Berichten" (in German). Retrieved 2022-10-09.
  2. Reck, Johann Stephan (1825). Geschichte der gräflichen und fürstlichen Häuser Isenburg, Runkel, Wied, verbunden mit der Geschichte des Rheinthals zwischen Koblenz und Andernach, von Julius Cäsar bis auf die neueste Zeit: Mit 10 Abb. v. Stammruinen, Münzen, einer Charte, Geschlechtstafeln und Urkunden (in German). Landes-Industrie-Comptoir.
  3. Denkwürdiger und nützlicher rheinischer Antiquarius: welcher die wichtigsten und angenehmsten geographischen, historischen und politischen Merkwürdigkeiten des ganzen Rheinstroms, von seinem Ausfluß in das Meer bis zu seinem Ursprunge, darstellt (in German). Hergt. 1853.
  4. Rothenburg, Friedrich Rudolf von (1835). Schlachten, Belagerungen und Gefechte in Deutschland und den angrenzenden Ländern [Battles, Sieges and Skirmishes in Germany and Neighboring Countries] (in German). A. St. v. Hirschfeld. p. 344 – via Google Books.
  5. Rothenburg 1835, p. 350.
  6. Baedeker (Firm), Karl (1884). Belgien und Holland nebst den wichtigsten Routen durch Luxemburg: Handbuch für Reisende (in German). K. Baedeker.
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