|Millennium:||1st millennium BC|
|265 BC by topic|
|Wikimedia Commons has media related to 265 BC.|
Year 265 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Gurges and Vitulus (or, less frequently, year 489 Ab urbe condita). The denomination 265 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Although the Egyptian fleet blockades the Saronic Gulf, the Macedonian King Antigonus II defeats the Spartans and kills the King of Sparta, Areus I near Corinth, after which he besieges Athens.
- Acrotatus II succeeds his father Areus I as king of Sparta.
- Hiero II threatens to renew his attack on the Mamertines. They appeal to Carthage and receive the support of a Carthaginian garrison. The Mamertines also appeal to the Romans who are also willing to help.
- The Battle of Messana (265-264 BCE) takes place as the first military clash between the Roman Republic and Carthage.
- The Etruscan city of Volsinii was brought under Roman control.
Arts & sciences
- The Archimedes screw for raising water is devised by the Greek mathematician Archimedes, who is studying at Alexandria.