|Millennium:||1st millennium BC|
|520 BC by topic|
The year 520 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 234 Ab urbe condita. The denomination 520 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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- Zhou dao wang, King of the Zhou Dynasty of China
- Zhou jing wang, King of the Zhou Dynasty of China from 544 to 520 BC.