Arnold of Altena

Arnold of Altena, count of Altena, count of Isenberg and Hövel, Vogt of Werden (1166–1209) was son of Eberhard IV of Berg. He inherited the north-western territorium of Altena, and became 1st count of Isenberg in 1200.

He married Mechtild countess of Holland and Styrum, a daughter of Floris III, Count of Holland. They had issue:

• Eberhard II count of Altena and Isenberg (born 1180, died 1209)

• Friedrich II of Isenberg, count of Altena and Isenberg (d. beheaded at Cologne 13 Nov 1226);

• Dietrich of Altena, Prince-Bishop of Münster (born before 1180, died on the way back from Rome to Limburg 18 Jul 1226);

• Engelbert of Altena, Prince-Bishop of Osnabrück (1224-deposed 1226 following his implication in Engelbert II of Berg's assassination, rehabilitated 1238-1250) (born before 1200, died 1250);

• Philipp of Altena, Propst zu Soest and Domthesaurar in Cologne (born before 1200, died 1264);

• Bruno of Altena, Prince-Bishop of Osnabrück (1250–1259) (born before 1200, died 20 December 1258);

• Gottfried of Altena, Probst zu St.Martin and Domdechant in Münster (born before 1220, died after 1247);

• Adolf von Holte (born 1220, died before 25 Jan 1260), married to Elisabeth von Holte (died after 1260). They had issue:
  • Heinrich von Holte, a prior in Cologne (fl. 1261/89);
  • Arnold von Holte, a priest (fl. 1266);
  • Wilhelm von Holte, a priest (fl. 1281);
  • Mechtild von Holte, heiress of Holte and Morenhoven (died 1301), married to Gerhard von Arberg, Bggf von Köln (d.1287);
  • Heilwig (fl. 1237/46), married to Wilhelm I von Horn; and
  • Christina (fl. 1257), married to Albero Schalle;

• Wilhelm of Altena, also called Wilhelm of Isenberg (born 1223, died 1242), He had a son, Wilhelm (fl. 1275), married to Christina NN;

• NN, a daughter, married to Hermann of Altena.

• Agnes of Altena, a daughter, married to Christian III, Count of Oldenburg