The indivisibility of the Duchy was not to Bolesław's liking, and in 1247 he persuaded his brother Przemysł I to provide territory for his sole leadership: the land between the Prosna River and Przemęt, north of the Warta River and thence to the Odra River; in short it was the Duchy of Kalisz. This division, though rather unjust for Bolesław, was approved by the Church, and after he protested, he was threatened with the excommunication. Despite the fact that he now had his own district, Bolesław did not pursue a foreign policy; this would continue to be the responsibility of his brother. This was revealed during the dispute with Duke Casimir I of Kuyavia regarding the possession of Ladzka, which was given to him by Henry II the Pious as a dowry for his daughter Constance, Casimir I's second wife. This decision was not recognized by Władysław Odonic's sons, but eventually they reconciled and even signed an alliance with the Kuyavian Duke, which effectively ended any attempt to change the ownership of the disputed land.