 However the nobility abided by Boleslaw's will, which had designated Władysław's elder half-brother Leszek II the Black as his heir.After Leszek II the Black's acquisition of power in Krakow and Sandomierz in 1279, Władysław, along with his younger brothers, recognized Leszek's sovereignty.This resulted in, among other things, the adoption of a coat of arms by all of the sons of Casimir I Kujawski