"Bolesław V the Chaste (Polish: Bolesław Wstydliwy; 21 June 1226 – 7 December 1279) was the Duke of Sandomierz in Lesser Poland from 1232 and High Duke of Poland from 1243 until his death, as the last male representative of the Lesser Poland branch of Piasts." - (en.wikipedia.org 31.01.2020)