Columbia subject headings:
Loyalty oaths--Italy--Mantua.
Mantua (Italy)--Politics and government--Sources.
Harvard subject headings:
Federico I Gonzaga, Marquis of Mantua, 1441-1484.
Loyalty oaths--Italy--Mantua.
Mantua (Italy)--Politics and government--Sources.
Princeton subject headings:
Loyalty oaths--Italy--Mantua.
Mantua (Italy)--Politics and government--Sources.