[4] An old Benedictine monastery, Pope Paul VI elevated it in 1973 to the rank of Minor Basilica.

The first true knowledge about the foundation of the abbey dates back to a document from the late 11th century, probably from the scriptorium of the monastery of Gladbach.

This richly illuminated document reports that a nobleman long before the founding of the abbey would have erected a church on the top of the hill, a church destroyed by the Magyars in 954.

In 1120, at the latest, the monastery was affected by the Benedictine reform Siegburg.

In order to carry out this plan, Master Gerhard, the first architect of Cologne Cathedral brought to his experience.