In 1000 his son and successor Bolesław I Chrobry founded the Diocese of Wrocław, which, together with the Bishoprics of Kraków and Kołobrzeg, was placed under the Archbishopric of Gniezno in Greater Poland, founded by Emperor Otto III at the Congress of Gniezno in the same year. The ecclesial suzerainty of Gniezno over Wrocław lasted until 1821. After a temporary shift to Bohemia in the first half of the 11th century, Lower Silesia continued to be an integral part of the Polish state until the end of its fragmentation period when all Polish claims on this land were finally renounced in favour of the Bohemian kingdom in 1348.