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.

The Kingdom of the Two Sicilies was a kingdom in Southern Italy from 1816 to 1861 under the control of a cadet branch of the Spanish Bourbons. The kingdom was the largest sovereign state by population and size in Italy before Italian unification, comprising Sicily and most of the area of today's Mezzogiorno in covering all of the Italian Peninsula south of the Papal States.