During the construction of Radom by Casimir the Great, the Benedictines erected the Chapel of the Virgin Mary, and in 1784 a new church of the Assumption of the Virgin Mary in Sieciechów, which still stands today. The Benedictines had the collegiate church of St. Andrew, built by Sieciech in Krakow, which they gave to the Poor Clares in exchange for the church of St. Giles. In 1593, Abbot Wereszczyński donated the church to the Krakow Academy, which was to support one student from the Sieciechów congregation. On the basis of the decision of the Piotrkowski Parliament, a school was established in Sieciechów, attended by children of the local nobility: Rogowski, Gniewosz, Bogusz, Kochanowski, Siemiński. The school ceased to exist after the congress of the Seym in 1575 and the rebellion of the French Party that destroyed the monastery. The monastery had one of the largest libraries in the country.