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I don't have enough context to write an accurate overview of "581." While you've indicated the context relates to a year, 581 AD is significant in history but could refer to multiple events or topics depending on what specifically matters for your purpose. Could you provide more details about what aspect of 581 you'd like me to explain?
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Article
The Sui dynasty (581–618)
Year 581 (DLXXXI) was a common year starting on Wednesday of the Julian calendar. The denomination 581 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.