Low German among the inhabitants of the area, accounts for the preservation of the language throughout the centuries. Another important factor was that after the Thirty Years' War, Saterland became part of the bishopric of Münster. As a consequence, it was brought back under control of the Catholic Church, resulting in social separation from Protestant East Frisia since about 1630. Catholic religious law demanded a confirmation of the non Catholic partner and this condition prevented contact, so marriages of Saterlanders were seldom contracted with East Frisians for some ages. References Endangered Germanic languages