​ALESIA, the ancient name for a hill in central France, now Alise-Ste-Reine (department Côte d’Or), where in 52 B.C. Caesar besieged the Gaulish national leader Vercingetorix within enormous entrenchments, forced him to surrender, and thus practically ended his conquest of Gaul. The siege-works have been excavated by Napoleon III. and others, down to the present day. The site seems to have been inhabited also during the Roman empire, but its importance is limited to Caesar’s siege.