Columbia subject headings:
Harvard subject headings:
Monasteries--Italy--Siena--History--Middle Ages, 600-1500.
Monasteries--Italy--Tuscany--History--Middle Ages, 600-1500.
Monasticism and religious orders--Italy--Siena--History--Middle Ages, 600-1500.
Monasticism and religious orders--Italy--Tuscany--History--Middle Ages, 600-1500.
Nobility--Italy--History--Middle Ages, 600-1500.
Princeton subject headings:
Monasteries--Italy--Siena--History--Middle Ages, 600-1500.
Monasteries--Italy--Tuscany--History--Middle Ages, 600-1500.
Monasticism and religious orders--Italy--Siena--History--Middle Ages, 600-1500.
Monasticism and religious orders--Italy--Tuscany--History--Middle Ages, 600-1500.
Nobility--Italy--History.