Mare Nostrum (Latin for "Our Sea") was a Roman name for the Mediterranean Sea. In the years following the unification of Italy in 1861, the term was revived by Italian nationalists who believed that Italy was the successor state to the Roman Empire.
The term mare nostrum originally was used by Romans to refer to the Tyrrhenian Sea, following their conquest of Sicily, Sardinia and Corsica during the Punic Wars with Carthage. By 30 BC, Roman domination extended from the Iberian Peninsula to Egypt, and mare nostrum began to be used in the context of the whole Mediterranean Sea. Other names were also employed, including Mare Internum ("The Internal Sea"); however, they did not include Mediterraneum Mare, which was a late Latin creation only attested to well after the Fall of Rome.
The rise of Italian nationalism during the "Scramble for Africa" of the 1880s led to calls for the establishment of an Italian colonial empire. The phrase was first revived by the Italian poet Gabriele d'Annunzio.