Following Heinrich Fluitter's vision of the Blessed Virgin Mary, a shrine and chapel were built on the site of it, which became a place of pilgrimage, the Marienwallfahrt. For the proper care of the site and the pilgrims land was given in 1480 to the Cistercians of Bottenbroich Abbey, who established a priory here, which they were able to move into on 4 April 1486. The new monastery took its name from the shrine to Mary and from the woods in which it was situated: "Marienwald", or "Mary's wood"