Columbia subject headings:
Ferdinand I, King of the Two Sicilies, 1751-1825.
Naples (Kingdom)--History--1735-1816.
Harvard subject headings:
Ferdinand I, King of the Two Sicilies, 1751-1825.
Naples (Kingdom)--History--1735-1816.
Princeton subject headings:
Ferdinand I, King of the Two Sicilies, 1751-1825.
Naples (Kingdom)--History--1735-1861.