He granted the property and estates to Cluny Abbey, making it the first Cluniac house in the German-speaking world.

In 1148, there were two priories that were dependent on Rüeggisberg, in Röthenbach im Emmental and Alterswil.

[2] At its peak the priory controlled estates throughout what is now the Canton of Bern, including Guggisberg, Alterswil, Plaffeien and Schwarzenburg, as well as scattered farm houses and vineyards on the shores of Lake Biel.

[2] The priory was one of the most important monastic houses of Switzerland during the Middle Ages, but in the late medieval period decline set in, and in 1484 it was incorporated into the newly-built college of the Augustinian Canons of Bern Minster.

[4] Between 1938 and 1947 the old foundations were again laid bare in an archaeological dig, as may be seen in the little museum next to the rectory.