The Tatar invasions of 1241 led to the decentralization of Silesia. Baronial patronage decreased whereas episcopal and later municipal patronage increased. The most important construction project of that time was the cathedral of Wrocław, which became the first pure Gothic building in Silesia. The chapel St. Hedwig in Trzebnica was another important structure of that era. Both building cited early French traditions, imported via Saxony, Bohemia and Austria. Most mendicant orders built their monasteries in the second half of the 13th century, most notably in Wrocław, Głogów, Brzeg and Strzelin. At the same time the first hall churches appeared. The most original were in Ziębice and Złotoryja (Goldberg).