The Kingdom of the Two Sicilies (Neapolitan: Regno d''e Ddoje Sicilie; Sicilian: Regnu d Dui Sicili; Italian: Regno delle Due Sicilie; Spanish: Reino de las Dos Sicilias) was a kingdom in Southern Italy from 1816 to 1860. The kingdom was the largest sovereign state by population and size in Italy before Italian unification, comprising Sicily and all of the Italian Peninsula south of the Papal States, which covered most of the area of today's Mezzogiorno.

The kingdom was formed when the Kingdom of Sicily merged with the Kingdom of Naples, which was officially also known as the Kingdom of Sicily. Since both kingdoms were named Sicily, they were collectively known as the "Two Sicilies" (Utraque Sicilia, literally "both Sicilies"), and the unified kingdom adopted this name. The king of the Two Sicilies was overthrown by Giuseppe Garibaldi in 1860, after which the people voted in a plebiscite to join the Savoyard Kingdom of Sardinia. The annexation of the Kingdom of the Two Sicilies completed the first phase of Italian unification, and the new Kingdom of Italy was proclaimed in 1861.

The Two Sicilies were heavily agricultural, like the other Italian states.

Gaeta (Italian: [ɡaˈeːta]; Latin: Cāiēta) is a city and comune in the province of Latina, in Lazio, Southern Italy. Set on a promontory stretching towards the Gulf of Gaeta, it is 120 kilometres (75 miles) from Rome and 80 km (50 mi) from Naples.

The town has played a conspicuous part in military history; its fortifications date back to Roman times, and it has several traces of the period, including the 1st-century BC mausoleum of the Roman general Lucius Munatius Plancus at the top of the Monte Orlando.

Gaeta's fortifications were extended and strengthened in the 15th century, especially throughout the history of the Kingdom of Naples (later the Two Sicilies). Present day Gaeta is a fishing and oil seaport, and a renowned tourist resort. NATO maintains a naval base of operations at Gaeta.