Saint Stanislaus of Cracow (1079)

He was a saintly Polish archbishop who, because of his courage in teaching the unequivocal Catholic Faith, drew on himself the anger of King Boleslaus II, who one day entered a church where Saint Stanislaus was celebrating Mass, and split his head open with a sword. Saint Stanislaus of Cracow was only forty-nine years old when this happened.

Unknown artist, “The Martyrdom of Saint Stanislaus” (source)