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- Mechtild, countess of Holland and Styrum, a daughter of Floris III, Count of Holland.
Children:
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\endash 1259) (born before 1200, died 20 December 1258);
Gottfried of Altena, Propst 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 (1223-1242). 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.
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Siblings
Frederick van Altena, b. 1193 d. 15 Nov 1226 (Age 33 years)
