in Southern Germany and along the Rhine. They probably indicate to the dynastic connection between Henry I and the House of Andechs. Characteristic attributes of all these buildings were the combination of brick constructions and details made of stone, which were most likely brought in via Altzella in Saxony. 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). A tower that remains of the castle in Prudnik is considered to be the oldest private defensive structure in Poland (circa 1255). Silesia's towns needed approximately 50 years after foundation to get their independence. In the 14th century, many of these towns began to build their own big parish churches, and with the assistance of the new Bohemian sovereign a dynamic sacral development program began. Dominant were now Bohemian, Moravian, Southern German and Lower Austrian architectural traditions, but mixed with local traditions which preferred more simple forms. The most characteristic creation of the entire 14th century remained the basilical municipal church with a long nave and no transept. This style was most probably derived from the Cistercian abbey in Zlatá Koruna (Goldenkron) in Bohemia. Although Silesia was now a part of Bohemia, a state of the Holy Roman Empire, the Parler Gothic had almost no influence. Architectural embellishments can only be found in three churches, probably all built by master builder Claus Brynner. This dynamic sacral development program lasted the entire 14th century, and starting at around 1370 many bigger cities added guild and family chapels to their parish churches. At the end of the century, all monastery construction projects ended, and with the spreading of the Hussite Wars to Silesia most building activities were greatly reduced. The expansion of the town hall in Wrocław after 1480 marked a big change in the architectural history of Silesia. As it was obvious that local