As the entire native population had become Protestant these monasteries were only maintained by the immigration of Catholics who, from the time of the Treaty of Westphalia, though in small numbers, steadily came into the country; thus there arose around the monasteries small Catholic communities.
Kuna kogu põliselanikkond sai protestantlikuks, olid need kloostrid ainsad, kes säilitasid katoliiklaste sisserände, kes Vestfaali rahust saati, kuigi väiksel arvul, pidevalt riiki tulid; seega tekkisid kloostrite ümber väikesed katoliiklikud kogukonnad.