In 1247 Przemysł I was forced by the local knights to give his brother Bolesław the district of Kalisz as a separated Duchy, but in foreign policy he retained full authority over Greater Poland [REF].
During the first half of the 13th century, Przemysł I promoted a more peaceful policy, working closely with his brother-in-law Konrad I of Głogów and giving his sister Euphemia in marriage to Duke Władysław of Opole [REF].