Columbia subject headings:
Effectiveness and validity of law--Italy--History.
Law, Medieval.
Law--Italy--History.
Harvard subject headings:
Effectiveness and validity of law--Italy--History--To 1500.
Effectiveness and validity of law--Italy--History.
Law, Medieval.
Law--Italy--History
Nullity--Italy--History--To 1500.
Revocation--Italy--History--To 1500.
Statutes--Italy.
Princeton subject headings:
Effectiveness and validity of law--Italy--History.
Law, Medieval.
Law--Italy--History.