The canons performed the general work of the ministry in the district of Leuven, in opposition to the heretic Tanchelm.

Simon died on 30 March 1142 and was succeeded by Philip, whose correspondence with Saint Hildegard of Bingen was preserved in the Park Abbey archives.

At the time there a canon living in the abbey, Blessed Rabado, whose devotion to the Passion was attested by miracles.

Abbot Gerard van Goetsenhoven (1414–34) had much to do with the establishment of the Catholic University of Leuven, and was also delegated by John IV, Duke of Brabant to transact state affairs with the King of England and the Duke of Burgundy.

Abbot van den Berghe (1543–58) managed the contributions levied in support of the Belgian theologians present at the resumed Council of Trent.

They all favoured higher education at the University of Leuven, and academic study flourished in the abbey.