Prince Boleslaw’s childhood occurs at a time when a massive political migration out of Poland is taking place, due to Sieciech’s political repressions.

Most of the elites who become political refugees find safe haven in Bohemia.

Another consequence of Sieciech’s political persecution is the kidnapping of Zbigniew by Sieciech’s enemies and his return from abroad in 1093.

Zbigniew takes refuge in Silesia, a stronghold of negative sentiment for both Sieciech as well as his nominal patron Wladyslaw I Herman.

In the absence of Sieciech and Boleslaw, who are captured by Hungarians and kept captive, Prince Wladyslaw I then undertakes a penal expedition to Silesia, which is unsuccessful and subsequently obliges him to recognize Zbigniew as a legitimate heir.

In 1093, Wladyslaw I signs an Act of Legitimization that grants Zbigniew the rights of descent from his line.

Zbigniew is also granted the right to succeed to the throne.