Adalbert of Prague (c. 956 - April 23, 997), known in the Czech Republic, Poland, and Slovakia by his birth name Vojtěch (Latin: Voitecus), was a Bohemian missionary and Christian saint. He was bishop of Prague and a missionary to the Hungarians, Poles, and Prussians, who was martyred in his efforts to convert the Baltic Prussians to Christianity. He is said to be the composer of the oldest Czech hymn, Hospodine, pomiluj ny, and Bogurodzica, the oldest known Polish hymn, but his authorship has not been confirmed. Adalbert was later declared the patron saint of the Czech Republic, Poland, and the Duchy of Prussia. He is also the patron saint of the Archdiocese of Esztergom in Hungary.