Columbia subject headings:
Cyril, Saint, Apostle of the Slavs, approximately 827-869.
Methodius, Saint, Apostle of the Slavs, approximately 825-884 or 885.
Harvard subject headings:
Cyril, Saint, Apostle of the Slavs, approximately 827-869.
Methodius, Saint, Apostle of the Slavs, approximately 825-884 or 885.
Princeton subject headings:
Christian saints--Europe, Eastern--Biography.
Cyril, Saint, Apostle of the Slavs, approximately 827-869.
Europe, Eastern--Church history.
Methodius, Saint, Apostle of the Slavs, approximately 825-884 or 885.