Henryk IV Probus
As a result of the fragmentation of Poland into smaller duchies, Strzegom became part of the Duchy of Silesia in the 12th century. The Piast Castle was built at that time. At the same time the building of the St. Peter and Paul parish church began, from 1203 under the patronage of the Order of Saint John. To help rebuild the devastated region after the first Mongol invasion of Poland (1241), Strzegom town granted town privileges by Anne of Bohemia, widow of the Silesian duke Henry II the Pious. In 1248 it passed to the Silesian Duchy of Legnica under Henry's son Bolesław II the Bald, contested by his nephew Henryk IV Probus, who, imprisoned by his uncle at Jelcz, finally had to renounce Strzegom in 1277. Since the 13th century Strzegom was a center of clothmaking. In the 1290s the defensive walls were erected. In 1307 a Benedictine monastery was established. In 1318 a bell was placed in the Church of Saints Peter and Paul, it remains the oldest bell still operating in Poland.