Bogurodzica (bɔɡurɔˈd͡ʑit͡sa, 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. It was recorded in writing at the beginning of the 15th century. Two records preserved till today date back to that time: the Kcynia record including two initial stanzas together with musical notation; the Kraków record covering thirteen stanzas without notes. Other records date back to the second half of the fifteenth century, the turn of the fifteenth and sixteenth centuries and to the beginning of the 16th century. In 1509, the hymn was printed in Kraków and incorporated into the "Statutes of Bishop Jan Łaski". The origin of the song is not clear, although Saint Adalbert is widely believed to be its author or contributor. It heavily reflected Latin and Christian liturgy as a whole. The two initial stanzas were created first - possibly in the middle or at the end of the thirteenth century, or possibly at the very beginning of the fourteenth century. Bogurodzica is a prayer hymn whose first stanza contains an invocation to Christ through the intercession of Mary. It begins with an apostrophe to her - to the Mother of Christ, the Virgin, praised by God, the chosen one. After the apostrophe, there is an appeal to Mary to win favour for people from her Son. The second stanza begins with a direct addresses to Christ (called God's Son) - with an invocation to John the Baptist who can support human imploring.