Columbia subject headings:
Monastic and religious life--History--Middle Ages, 600-1500.
Monasticism and religious orders--History--Middle Ages, 600-1500.
Harvard subject headings:
Monasticism and religious orders--History--Early church, 30-600.
Monasticism and religious orders--History--Early church, ca. 30-600.
Monasticism and religious orders--History--Middle Ages, 600-1500.
Monasticism and religious orders--Liturgy.
Monks--Europe--History.
Princeton subject headings:
Monastic and religious life--History--Middle Ages, 600-1500.
Monasticism and religious orders--History--Middle Ages, 600-1500.