Bogurodzica (, calque of the Greek term Theotokos), in English known as the Mother of God, is a medieval Roman Catholic hymn composed sometime between the 10th and 13th centuries in Poland. It is believed to be the oldest religious hymn or patriotic anthem in the Polish language, which was traditionally sung in Old Polish with the Greek phrase Kyrie eleison – "Lord, have mercy". While its origin is not entirely clear, several scholars agree that Saint Adalbert of Prague is the likely author. Polish knights chanted Bogurodzica prior to their engagement at the Battle of Grunwald and it also accompanied the coronation ceremonies of the first Jagiellonian kings.
