In 1231, Bolesław I became involved with his father and brothers in the installation of the Teutonic Knights in the region of Chełmno Land.

To compensate for the loss of the Duchy of Sandomierz, Konrad I offered his son parts of Masovia, with the district of Sieradz as the capital.

In 1241, after the death of his father-in-law Henry II the Pious at the Battle of Legnica, Bolesław I supported his father's military seizure of Kraków, who this time was able to conquer the Seniorate.

His rule lasted only two years, until the Battle of Suchodoły on 25 May 1243, when Konrad I was defeated and forced to retire to Sieradz.

In his father's will, he received most of Masovia; shortly after, he had to face an attack of his brother Casimir I, because he was dissatisfied with his portion of their paternal inheritance.

After her husband's death, she remarried with a Hungarian magnate called Demetri, probably member of the Aba family.