About 1217 the canonesses of Ahnaberg Priory near Kassel were permitted to establish a daughter-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 a newly established daughter-house at Eppenberg. The relationship of the new priory to its motherhouse was clearly not without friction. In 1223 the provost and community of Ahnaberg re-stated their rights in Eppenberg. On 17 February 1224 Archbishop Siegfried once more confirmed the rights of Ahnaberg Priory. But in 1250, for reasons now unknown, the prioress of Eppenberg openly rejected the rights of Ahnaberg, and Eppenberg became an independent house, now, like Ahnaberg, under the supervision and protection of Spieskappel Abbey. The newly independent priory rapidly flourished, mostly because of gifts and acquisitions of land in the nearby villages of Altenbrunslar, Böddiger, Besse and Gensungen. In 1269 Eppenberg was able to found a daughter house at Homberg an der Efze. Growing prosperity however led to a decline in morals and discipline, and eventually to prodigality, mismanagement, and economic collapse.
Charterhouse
, greatly offended at the conditions in the priory, the neglected estates and buildings, and the loss of discipline, rigor and order, obtained a Papal bull in 1438 to dissolve the Premonstratensian priory and replaced it by a charterhouse, which was settled by hermits from Erfurt in 1440. The buildings were rebuilt as a hermitage, re-dedicated to Saint John the Baptist, and generously and extensively rebuilt. In 1471 Landgrave Ludwig II of Hesse gave the Charterhouse the estate of Wimmenhof and the nearby, half-derelict Heiligenburg Castle, on the condition that the hermits should pray weekly in the castle chapel for its salvation.
In 1957 the principal building was struck by lightning and burnt down, leaving only the bare walls. The buildings and the monastery church fell increasingly into dereliction, until in 1984 the Felsberg Beekeepers' Association took on the task of restoring and caring for the site. In the former gatehouse they established a highly regarded museum of bee-keeping. Of the monastery itself the only remains are those of the church. The area around the charterhouse site and the ruins themselves were declared a nature reserve in December 1988.