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|Millennium:||1st millennium BC|
|465 BC by topic|
|Gregorian calendar||465 BC|
|Ab urbe condita||289|
|Ancient Egypt era||XXVII dynasty, 61|
|- Pharaoh||Artaxerxes I of Persia, 1|
|Ancient Greek era||78th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||乙亥年 (Wood Pig)|
2232 or 2172
— to —
丙子年 (Fire Rat)
2233 or 2173
|Coptic calendar||−748 – −747|
|Ethiopian calendar||−472 – −471|
|- Vikram Samvat||−408 – −407|
|- Shaka Samvat||N/A|
|- Kali Yuga||2636–2637|
|Iranian calendar||1086 BP – 1085 BP|
|Islamic calendar||1119 BH – 1118 BH|
|Minguo calendar||2376 before ROC|
|Thai solar calendar||78–79|
−338 or −719 or −1491
— to —
−337 or −718 or −1490
Year 465 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Vibulanus and Barbatus (or, less frequently, year 289 Ab urbe condita). The denomination 465 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.
- King Xerxes I of the Persian Empire, together with his eldest son, is murdered by one of his Ministers, Artabanus the Hyrcanian. The Persian general, Megabyzus, is thought to have been one of the conspirators in the assassination.
- Artabanus gains control of the Achaemenid state for several months. However, he is betrayed by Megabyzus and is killed by Xerxes' son, Artaxerxes.
- Thasos revolts from the Delian League. The revolt arises from rivalry over trade with the Thracian hinterland and, in particular, over the ownership of a gold mine. Athens under Kimon lays siege to Thasos after the Athenian fleet defeats the Thasos fleet.
- Tholos, west side of Ancient Agora of Athens, is built (approximate date).
- Phidias begins producing the sculpture called The Athena Promachos (The Defender) and completes it ten years later.
- Xerxes I, king of Persia (murdered) (b. c. 519 BC)
- King Goujian of Yue, king of the Chinese State of Yue