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521 BC
The year 521 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 233 Ab urbe condita. The denomination 521 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.
| Column 1 | Column 2 |
|---|---|
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| Gregorian calendar |
|---|
| 233 |
| XXVII dynasty, 5 |
| Darius I of Persia, 1 |
| 64th Olympiad, year 4 |
| 4230 |
| N/A |
| −1114 – −1113 |
| 430 |
| 24 |
| −1158 |
| 4988–4989 |
| 己卯年 (Earth Rabbit)2177 or 1970 — to —庚辰年 (Metal Dragon)2178 or 1971 |
| −804 – −803 |
| 646 |
| −528 – −527 |
| 3240–3241 |
| −464 – −463 |
| N/A |
| 2580–2581 |
| 9480 |
| 1142 BP – 1141 BP |
| 1177 BH – 1176 BH |
| N/A |
| N/A |
| 1813 |
| 2432 before ROC民前2432年 |
| −1988 |
| 22–23 |
| ས་མོ་ཡོས་ལོ་(female Earth-Hare)−394 or −775 or −1547 — to —ལྕགས་ཕོ་འབྲུག་ལོ་(male Iron-Dragon)−393 or −774 or −1546 |
The year 521 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 233 Ab urbe condita. The denomination 521 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.
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Darius I succeeded Gaumata as ruler of Persia.
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Leonidas I. King of Sparta
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March – Cambyses, ruler of ancient Persia (suicide)
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October – Gaumata, ruler of ancient Persia
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