The former St. Stephen's Monastery is a ruin on the Heiligenberg.
Zundebold, provost in the nearby Michael Monastery, took a liking to Arnold's cell and four years later, with the permission of Lorsch Monastery, had buildings added to the church. From here, every movement in the Neckar valley could be observed from afar, because the hilltop was bare. Due to construction and heating, a large part of the forest had been cut down. At the same time, the old cistern (the Heidenloch) was repaired. St. Stephan was assigned its district and was thus economically independent.