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.