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|Millennium:||1st millennium BC|
|485 BC by topic|
|Gregorian calendar||485 BC|
|Ab urbe condita||269|
|Ancient Egypt era||XXVII dynasty, 41|
|- Pharaoh||Xerxes I of Persia, 1|
|Ancient Greek era||73rd Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||乙卯年 (Wood Rabbit)|
2212 or 2152
— to —
丙辰年 (Fire Dragon)
2213 or 2153
|Coptic calendar||−768 – −767|
|Ethiopian calendar||−492 – −491|
|- Vikram Samvat||−428 – −427|
|- Shaka Samvat||N/A|
|- Kali Yuga||2616–2617|
|Iranian calendar||1106 BP – 1105 BP|
|Islamic calendar||1140 BH – 1139 BH|
|Minguo calendar||2396 before ROC|
|Thai solar calendar||58–59|
−358 or −739 or −1511
— to —
−357 or −738 or −1510
Year 485 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Cornelius and Vibulanus (or, less frequently, year 269 Ab urbe condita). The denomination 485 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.
- Darius I, one of the greatest rulers of the Achaemenid dynasty of Persia, dies and is succeeded by his son, Xerxes I. During this time the Persian empire extends as far west as Macedonia and Libya and as far east as the Hyphasis (Beas) River; it stretches to the Caucasus Mountains and the Aral Sea in the north and to the Persian Gulf and the Arabian Desert in the south.
- Gelo, the tyrant of Gela, takes advantage of an appeal by the descendants of the first colonist of Syracuse, the Gamoroi, who had held power until they were expelled by the Killichiroi, the lower class of the city, and makes himself master of that city, leaving his brother Hieron to control Gela.
- Three times Roman consul Spurius Cassius Viscellinus is tried, condemned and executed for high treason.
- The consul Quintus Fabius Vibulanus defeated the Volsci and Aequi in battle, but incurred the anger of the plebs by lodging the spoils of victory with the publicum.