from his brother Bolesław, who after Konrad's death about 1180/90 again inherited it. After his brother Bolesław I had died, Mieszko I Tanglefoot also conquered and took the Duchy of Opole from his nephew Henry I the Bearded. He ruled over the Racibórz and Opole duchies, which emerged as Upper Silesia, until his death in 1211. Henry I the Bearded remained sovereign of the Lower Silesian Duchy of Wrocław, he acquired the Greater Polish lands of Kalisz in 1206, which he granted to his Piast cousin Władysław Odonic, as well as Lubusz Land in 1210. High Duke of Poland from 1232, he conquered further Greater Polish territories around Santok in 1234. Mieszko's heir was Duke Casimir I of Opole, who died in 1230. Thereupon, Henry I managed to reunite whole Silesia under his reign. He was succeeded by his son Henry II the Pious in 1238, while Upper Silesia was inherited by Casimir's son Mieszko II the Fat in 1239. He and his younger brother, Władysław Opolski, had already received Greater Polish Kalisz in 1234. Henry II was killed at the Battle of Legnica in 1241. His eldest son and heir, Duke Bolesław II the Bald temporarily gave Lubusz Land to his younger brother Mieszko († 1242). He reconciled with his Greater Polish cousin Duke Przemysł I and finally returned Santok in 1247 and remained sole ruler of Lower Silesia until 1248. Mieszko II the Fat, of Upper Silesia, in 1244, returned Kalisz to Duke Przemysł I of Greater Poland. He died in 1246 and his possessions were inherited by his brother Władysław Opolski. Duchies of the Bohemian Crown (1335–1918) In 1327, King John I of Bohemia began accepting the fealty of the Silesian dukes as part of his claim on the Polish crown. At the Treaty of Trentschin on 24 August 1335 it was agreed that John would abandon his claim and in return receive the suzerainty of the Silesian duchies and a one-time payment (20,000 threescores of Prague groschen). This was finalized at the Congress of Visegrád in the same year, although some Piast-ruled duchies remained outside of Bohemian suzerainty until 1392. Under the Bohemian crown, the duchies continued to be ruled by branches of the Piast dynasty known as the Silesian Piasts until their last lineage died out in 1675. When a ducal lineage died out, the duchy passed to the crown and became a state country.