He appeared for the first time in sources, together with his mother and brother, in a document dated 10 July 1316 and issued by Florian, Bishop of Płock concerning with the payment of tithes.
In 1323 together with his brother Władysław, he founded a hospital for the Order of the Holy Sepulchre at Rypin.
It is known that Bolesław took part in the exchange of the district of Dobrzyń for Łęczyca, which was made after the threats of the Teutonic Order and concluded in 1327/1328 between the princes and their uncle Władysław I the Elbow-high.
This agreement was formalized on 1 October 1327,[4] and on 12 March 1329 Władysław the Hunchback issued the first known document without Bolesław.
[5] Is believed that his death occurred in 1328, shortly after the change of the Duchies, because only few witnesses remember that he took part in it.