The musical tradition of the Czech lands arose from the first church hymns, whose first evidence is suggested at the break of the 10th and 11th centuries. Some pieces of Czech music include two chorales, which in their time performed the function of anthems: "Lord, Have Mercy on Us" and the hymn "Saint Wenceslas" or "Saint Wenceslas Chorale". The authorship of the anthem "Lord, Have Mercy on Us" is ascribed by some historians to Saint Adalbert of Prague (sv.Vojtěch), bishop of Prague, living between 956 and 997.