Bolesław IV the Curly
After the death of his Mieszko's brother Bolesław IV the Curly in 1173, he also became High Duke of Poland according to the principle of agnatic seniority as laid down in Bolesław's testament. However, he soon had to face a rebellion at Kraków instigated by Lesser Polish magnates led by his younger brother Casimir II the Just with the support of Mieszko's own son Odon fearing for his heritage. Casimir assumed the high ducal title, while in 1179 Odon even expelled his father from the Greater Polish lands. Mieszko fled to the Duchy of Pomerania at the court of Duke Bogislaw I, husband of his daughter Anastasia.