In the first half of the 13th century duke Henry I the Bearded of the Silesian line of the Piast dynasty, managed to reunite much of the divided Polish kingdom. He became the duke of Kraków (Polonia Minor) in 1232, which gave him the title of the senior duke of Poland (see Testament of Bolesław III Krzywousty). Henry tried to achieve the Polish crown but he didn't manage to succeed. His activity in this field was continued by his son and successor Henry II the Pious whose work towards this goal was halted by his sudden death in the 1241 (Battle of Legnica). Polish territories acquired by the Silesian dukes in this period are called "The monarchy of the Silesian Henries". Wrocław was the centre of the divided Kingdom of Poland.