 After the whole Uckermark region had passed to the Margraves of Brandenburg according to the 1250 Treaty of Landin, a Cistercian monastery at the site was founded; documented since 1271, about the time when nearby Chorin Abbey was established.In 1536 the abbey was secularised during the Protestant Reformation and devastated by Danish troops in the Thirty Years' War one hundred years later.Boitzenburg Castle was first mentioned in 1276, it was occupied by Margrave William I of Meissen in 1398 but returned to Brandenburg in 1415.