Petrus Zwicker

Petrus Zwicker was a Celestine monk and inquisitor born at Wormditt in East Prussia. He served as school rector at Zittau until 1381, when he entered the Celestine monastery on the Oybin; by 1395 he was its prior and provincial of the Celestines in Germany.

From 1390 he was entrusted with pursuing heretics, and between 1391 and his death in Vienna in 1403 he directed one of the largest inquisitorial campaigns of the later Middle Ages, ranging through Austria, Pomerania, Brandenburg and Hungary and aimed almost entirely at the Waldensians.