Arnold of Altena
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Arnold of Altena, count of Altena, count of Isenberg and Hövel, Vogt of Werden, (1166 – 1209), 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:
- 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

