Dietrich I of Isenberg
Dietrich I was disinherited of all his territories in the First Reich (German Realm) of the Holy Roman Empire following the execution of his father, but with the military support of his uncle the Duke of Limburg, recovered a small territory out of his previous possessions. He built the castles of Limburg (Hohenlimburg) and Neu Isenberg (soon lost in favour of the counts von der Mark) and took the title of count of Limburg.
He married Aleidis (Adelheid), countess of Sayn, a daughter of Johann I von Spanheim and Adelheid von Altena. They had issue:
- Heinrich of Limburg (living 1240-1246);
- Johann of Isenberg-Limburg, count of Limburg (born before 1246, died before 1277). He married Agnes von Wildenberg;
- Elisabeth countess of Limburg (born before 1253, died 1311). She married Heinrich von Wildenburg, son of Gerhard II von Wildenburg;
- Sophie countess of Limburg-Isenberg (born before 1253), married to Bertold VI von Buren, Marschall of Westfalia (born before 1284, died after 1320), a son of Bertold IV von Buren and Dedel von Arnsberg;
- Adelheid (born before 1253, died after 1266). She married Albert II Ritter von Hoerde (born before 1226, died after 1266);
- Eberhard I count of Limburg (born before 1271, died after 1304. He married Agnes NN.
- Genealogische Handbuch des Adels, Gräfliche Häuser A Band II, 1955;
- W. Gf v. Limburg Stirum, "Stamtafel der Graven van Limburg Stirum", 's Gravenhage 1878;
- A.M.H.J. Stokvis, "Manuel d'Histoire, de Genealogie et de Chronologie de tous les États du Globe", Tome III, Leiden 1890-93;
- W. K. Prins v. Isenburg, "Stammtafeln zur Geschichte der Europaischen Staaten", 2. Aufl., Marburg/Lahn, 1953.