Still in the 1750s, under the rule of Empress Maria Theresa, several Protestant peasants were exiled and deported to Transylvania.
Remote valleys of the region remained centres of Crypto-protestantism.
The abbey even included a nunnery, which was dissolved in the 15th century.
In 1245 the abbot of Millstatt even received the pontifical vestments from the Salzburg Archbishop.
The abbey prospered during its early years, enjoying special papal protection, again confirmed by Pope Alexander III in an 1177 deed; it was however never officially exempt and remained under the overlordship of the Archbishops of Salzburg.
The premises included an adjacent nunnery and a well-known scriptorium, where the Benedictine monks left numerous manuscripts, though the most famous Middle High German Millstätter Handschrift (Millstatt Manuscript) probably did not originate here.
At the same time, Count palatine Engelbert, a scion of the House of Gorizia and brother of Count Meinhard I, shortly before his death put the monastery under the protection of Pope Callixtus II.
The monastery had definitely been established before 1122, when it was mentioned in a deed issued by Pope Callixtus II.Millstatt Abbey (German: Stift Millstatt) is a former monastery in Millstatt, Austria.Established by Benedictine monks about 1070, it ranks among the most important Romanesque buildings in the state of Carinthia.The last grand master did not even reside at Millstatt, and from 1541 onwards the estates were under the rule of Inner Austrian administrators and given in pawn several times.In 1598 the Inner Austrian archduke Ferdinand II, a devout Catholic, vested the Society of Jesus at Graz with Millstatt.