Columbia subject headings:
Ambassadors--Spain--Biography.
Hurtado de Mendoza, Diego, 1503-1575.
Siena (Italy)--Relations--Spain.
Spain--Relations--Italy--Siena.
Harvard subject headings:
Ambassadors--Spain--Biography
Hurtado de Mendoza, Diego, 1503-1575.
Siena (Italy)--Politics and government.
Siena (Italy)--Relations--Spain.
Spain--Relations--Italy--Siena.
Princeton subject headings:
Ambassadors--Spain--Biography.
Hurtado de Mendoza, Diego, 1503-1575.
Siena (Italy)--Relations--Spain.
Spain--Relations--Italy--Siena.