|Millennium:||1st millennium BC|
|514 BC by topic|
|Gregorian calendar||514 BC
|Ab urbe condita||240|
|Ancient Egypt era||XXVII dynasty, 12|
|- Pharaoh||Darius I of Persia, 8|
|Ancient Greek era||66th Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||丙戌年 (Fire Dog)
2183 or 2123
— to —
丁亥年 (Fire Pig)
2184 or 2124
|Coptic calendar||−797 – −796|
|Ethiopian calendar||−521 – −520|
|- Vikram Samvat||−457 – −456|
|- Shaka Samvat||N/A|
|- Kali Yuga||2587–2588|
|Iranian calendar||1135 BP – 1134 BP|
|Islamic calendar||1170 BH – 1169 BH|
|Minguo calendar||2425 before ROC
|Thai solar calendar||29–30|
−387 or −768 or −1540
— to —
−386 or −767 or −1539
The year 514 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 240 Ab urbe condita . The denomination 514 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.
- Suzhou City in China was founded by Wu Zixu
- King Helu of Wu ascends to the throne of Wu in Zhou Dynasty China. He establishes Suzhou as his capital.
- Darius I leads his Persian army across the Bosphorus and campaigns unsuccessfully against the Scythians on the Danube.
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- Harmodius and Aristogeiton, two men from ancient Athens who became known as the Tyrannicides (τυραννοκτόνοι) after killing the Peisistratid tyrant Hipparchus, and were the preeminent symbol of democracy to ancient Athenians.
- Hipparchus (son of Peisistratos), a member of the ruling class of Athens. He was one of the sons of Peisistratos.
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