Silesian architecture is the name given to the constructions made in Silesia throughout time, and those by Silesian architects worldwide. The name is also applied to buildings made within its geographical limits before the constitution of Silesia as a duchy (earlier than 1172) or before this name was given to those territories, and largely depends on the historical moment. Due to historic, geographic and generational diversity, Silesian architecture has known a host of influences. Romanesque architecture The Romanesque art in Silesia appeared with the Christianization of the region. The first known structure, relics of a church on Ostrów Tumski in Wrocław (Breslau), was built in the mid-10th century. Around 1000 Bolesław I of Poland founded a three-nave cathedral on the same place, styled after the cathedral in Gniezno. Few other buildings of that time are known. The rotunda in Cieszyn (Teschen, Těšín), of Moravian- Bohemian origin, dates back to 1050. The 12th century was a time of great advancement. The first monasteries and minsters, in Wrocław and Lubiąż (Leubus), were built, and the quality of work improved significant, as the builders adopted architectural styles from Southern Germany and Meuse. Outstanding achievements of this era were the cathedral and the abbey church of the Benedictine order in Wrocław, the latter being the most magnificent romanesque building in Silesia. It was planned after its mother church in Tyniec near Kraków, whereas its Westwork was influenced by Thuringian traditions. The church of the first Cistercian monastery in Lubiąż, built by monks from Pforta in Thuringia, was the first of many building made of brick in Silesia. The beginning of the 13th century was marked by a big increase in building activity, caused by the large influx of German settlers (Ostsiedlung). Most of the municipal churches in Silesia, built of stone or brick, emerged at that time. Examples were Głogów (Glogau), Nysa (Neiße), Jelenia Góra (Hirschberg) or Ziębice (Münsterberg). These late Romanesque Silesian churches were a mix of local, Saxon-Thuringian and Bohemian traditions. There are only seven known examples of that time in Upper Silesia, but 67 in Lower Silesia, including secular buildings. Silesian Gothic The heralds of Gothic architecture were connected with the building activities of the Cistercians and the patronage of Henry I the Bearded. Two monasteries, in Trzebnica (Trebnitz) and in Henryków (Heinrichau), as well as two residences, in Wrocław and Legnica (Liegnitz), were early examples and referred to architectonic standards