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Pope Innocent IV canonises Stanislaus of Szczepanów, killed by King Bolesław II.

Related Wikipedia articles
Pope Innocent IV
Head of the Catholic Church from 1243 to 1254
Pope Innocent IV, born Sinibaldo Fieschi, was head of the Catholic Church and ruler of the Papal States from 25 June 1243 to his death in 1254.Source: Wikipedia (CC BY-SA)
Stanislaus of Szczepanów
11th-century Polish Catholic bishop
Stanislaus of Szczepanów was a Polish Catholic prelate who served as Bishop of Kraków and was martyred by the Polish King Bolesław II the Bold. He is the patron saint of Poland.Source: Wikipedia (CC BY-SA)
Bolesław II the Bold
Duke of Poland (1058–76); King of Poland (1076–79)
Bolesław II the Bold, also known as the Generous, was Duke of Poland from 1058 to 1076 and King of Poland from 1076 to 1079. He was the eldest son of Duke Casimir I the Restorer and Maria Dobroniega of Kiev.Source: Wikipedia (CC BY-SA)