Columbia subject headings:
Harvard subject headings:
Gregorius, Saint, cardinal, bp. of Ostia, -1044.
Ildefonsus, Saint, Abp. of Toledo.
Isidore, of Seville, Saint, -636
Princeton subject headings:
Benedictines--Spain--Biography.
Catholic Church--Spain--Biography.
Christian saints--Spain--Biography.
Gregory, of Ostia, Saint, -1044.
Ildephonsus, Saint, approximately 610-667.
Isidore, of Seville, Saint, -636.