Brother of Saint Adalbert of Prague. Benedictine monk at the abbey of Saint Alexius in Rome, Italy. Priest. Assisted with evangelizing work of Saint Adalbert. Imprisoned with his brother for his faith. Archbishop of Gniezno, Poland in 1000.
- “Saint Guiadenzio of Gniezno“. CatholicSaints.Info. 11 October 2016. Web. 22 February 2017. <>