In about 1217 the Premonstratensian canonesses of Ahnaberg Priory near Kassel were permitted to establish a subsidiary house on the Eppenberg, on the shoulder of the Heiligenberg. This foundation was confirmed on 3 March 1219 by Siegfried II, Archbishop of Mainz, who took it under his protection. The total number of canonesses in Ahnaberg was set at 40, and the remainder moved to the newly established daughter house at Eppenberg.