Apart from the question of an actual enfeoffment of Władysław's sons by the emperor, a disruption between them and their Piast cousins had occurred. In the following centuries, Silesia was divided into as many as 17 separate duchies among their descendants and successors, who from the early 14th century onwards gradually became vassals of the Imperial Kingdom of Bohemia. By the 1335 Treaty of Trentschin the Polish king Casimir III the Great renounced all claims to the Silesian lands, which remained under the rule of the Silesian Piasts until the male line of the dynasty finally became extinct with the death of Duke George William of Legnica in 1675.