Background
He was the fourth and youngest son of Duke Bolesław I of Cieszyn by his second wife Euphemia, daughter of Duke Siemowit IV of Masovia. After the death of his father in 1431, Bolesław II ruled over the duchy together with his brothers as co-rulers, but under the tutelage of their mother.
Career
Těšín), German: Boleslaus World War II After the division of the duchy on 29 November 1442, he still held the title of Duke of Cieszyn, but in practice ruled only over 16 towns and villages in Cieszyn. The most important of them was Frysztat, which was obtained by Bolesław II only after his mother"s death in 1447 and shortly after, received broader city rights by Bolesław World War II In 1443 he supported Poland in his conflicts with Hungary, and in 1449 he was appointed judge in the disputes between King Casimir IV and the Bohemian nobility. However, Bolesław II"s good relations with Poland didn"t prevent the sale of the Duchy of Siewierz to Zbigniew Oleśnicki, Bishop of Krakow, which resulted in a war at Upper Silesia, who lasted until February 1447.
But his plans ended with his sudden death on 4 October 1452.