Isenberg

Isenberg was a County of medieval Germany. It was a partition of the county of Altena and was annexed to Limburg(Lenne) in 1242.

Counts of Isenberg (1191–1242)

 * Eberhard I, Count of Berg-Altena (1140–1180) count of Altena of the burg Altena on the river Lenne.
 * Arnold of Altena (1180–1209) count of Altena-Isenberg of the burg Isenberg on the river Lenne.
 * Frederick of Isenberg (1209–1226) count of Altena-Isenberg of the burg Isenberg on the river Ruhr.
 * Dietrich I of Isenberg (1226–1301) count of Limburg of the Hohenlimburg on the river Lenne.