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Wenceslaus I, Wenceslas I or Václav the Good was the Prince (kníže) of Bohemia from 921 until his death, probably in 935. According to the legend, he was assassinated by his younger brother, Boleslaus the Cruel. His martyrdom and the popularity of several biographies gave rise to a reputation for heroic virtue that resulted in his sainthood. He was posthumously declared to be a king and patron saint of the Czech state. He is the subject of the well-known "Good King Wenceslas", a carol for Saint Stephen's Day.