Boles%C5%82aw V the Chaste

Bolesaw V the Chaste , was a Duke of Sandomierz in Lesser Poland from 1232 and High Duke of Poland from 1243 until his death, as the last male representant of the Piast Lesser Poland branch.

Bolesaw V was born onJune 1226 at Stary Korczyn, as the third child and only son of Leszek I the White by his wife Grzymisawa, a Rurikid princess of disputed parentage.

Source: Wikipedia