While the exact origins of the name are unknown, the name Lacus Lemanus was in use during the time of Julius Caesar.[4] Lemannus comes from Ancient Greek Liménos Límnē (Λιμένος Λίμνη) meaning "port's lake"; it became Lacus Lausonius, although this name was also used for a town or district on the lake, Lacus Losanetes, and then the Lac de Lausanne in the Middle Ages. Following the rise of Geneva it became Lac de Genève (translated into English as Lake Geneva), but Lac Léman was the common name on all local maps and is the customary name in the French language.