Joseph-Napoléon Bonaparte was a French statesman, lawyer, diplomat and older brother of Napoleon Bonaparte. During the Napoleonic Wars, the latter made him King of Naples (1806–1808), and then King of Spain (1808–1813). After the fall of Napoleon, Joseph styled himself Comte de Survilliers and emigrated to the United States, where he settled near Bordentown, New Jersey, on an estate overlooking the Delaware River not far from Philadelphia.

Ferdinand I was King of the Two Sicilies from 1816 until his death. Before that he had been, since 1759, King of Naples as Ferdinand IV and King of Sicily as Ferdinand III. He was deposed twice from the throne of Naples: once by the revolutionary Parthenopean Republic for six months in 1799, and again by a French invasion in 1806, before being restored in 1815 at the end of the Napoleonic Wars.