Columbia subject headings:
Catholic Church--Italy--Siena--History.
Church and state--Italy--Siena--History--12th century.
Church and state--Italy--Siena--History--13th century.
Siena (Italy)--Church history.
Siena (Italy)--History--12th century.
Siena (Italy)--History--13th century.
Siena (Italy)--Intellectual life--12th century.
Siena (Italy)--Intellectual life--13th century.
Harvard subject headings:
Catholic Church--Italy--Siena--History.
Catholic Church. Diocese of Siena (Italy)--History.
Church and state--Italy--Siena--History.
Siena (Italy)--Church history.
Siena (Italy)--History.
Siena (Italy)--Intellectual life.
Princeton subject headings:
Catholic Church--Italy--Siena--History.
Church and state--Italy--Siena--History--12th century.
Church and state--Italy--Siena--History--13th century.
Siena (Italy)--Church history.
Siena (Italy)--History--12th century.
Siena (Italy)--History--13th century.
Siena (Italy)--Intellectual life--12th century.
Siena (Italy)--Intellectual life--13th century.