In 1249 Bolesław, dissatisfied with the tutelage of his older brother, persuaded him to make a new division of their patrimony. He received the Duchies of Kalisz and Gniezno, with the addition of Wieluń, which had recently been returned to the rule of Władysław Odonic's sons. This new division was apparently made peacefully, because later in that same year the brothers together gave support to Konrad I of Głogów against his brother Bolesław II the Bald. However, on 19 May 1250 an unexplained event took place, which was related in the "Chronicle of Greater Poland":