|Millennium:||1st millennium BC|
|612 BC by topic|
|Gregorian calendar||612 BC|
|Ab urbe condita||142|
|Ancient Egypt era||XXVI dynasty, 53|
|- Pharaoh||Psamtik I, 53|
|Ancient Greek era||42nd Olympiad (victor)¹|
|Balinese saka calendar||N/A|
|Chinese calendar||戊申年 (Earth Monkey)|
2085 or 2025
— to —
己酉年 (Earth Rooster)
2086 or 2026
|Coptic calendar||−895 – −894|
|Ethiopian calendar||−619 – −618|
|- Vikram Samvat||−555 – −554|
|- Shaka Samvat||N/A|
|- Kali Yuga||2489–2490|
|Iranian calendar||1233 BP – 1232 BP|
|Islamic calendar||1271 BH – 1270 BH|
|Minguo calendar||2523 before ROC|
|Thai solar calendar||−69 – −68|
−485 or −866 or −1638
— to —
−484 or −865 or −1637
The year 612 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 142 Ab urbe condita . The denomination 612 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.
- Battle of Nineveh: An allied army of Babylonians, Medes, Scythians, and Susianians besieges and conquers Nineveh, capital of the Neo-Assyrian Empire. Sinsharishkun, King of Assyria, is killed in the sacking.
- Babylon, capital of the Neo-Babylonian Empire, becomes the largest city in the world, taking the lead from Nineveh.
- Ashur-uballit II attempts to keep the Assyrian state alive by establishing himself as king at Harran.
- King Kuang of Zhou becomes king of the Zhou Dynasty of China.
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- Sinsharishkun, Assyrian king
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