Duke of Dobrzyń Duke of Łęczyca
He was Duke of Dobrzyń during 1312-1327 (until 1316 under the regency of his mother and since them under the tutelage of his oldest brother) and Duke of Łęczyca since 1327 jointly with his brother. He was the fourth or second son of Siemowit of Dobrzyń and Anastasia, daughter of Leo I of Halych-Peremyshl.
lieutenant"s unknown after whom he was named. Probably was in honour to Bolesław II of Płock, his father"s cousin. Bolesław never ruled by himself.
His last mention in documents was on 20 March 1326.
This agreement was formalized on 1 October 1327, and on 12 March 1329 Władysław the Hunchback issued the first known document without Bolesław. lieutenant"s unknown if the brothers ever divided the Duchy of Łęczyca, although is also known that Bolesław issued documents alone.
Therefore is considered that Bolesław died between 1 October 1327 and 12 March 1329. 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 lieutenant
