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I don't have enough context to write an accurate overview of "591." The context provided only indicates "year," which isn't sufficient to explain what 591 refers to or its significance. Could you provide more information about what "591" is?
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King Khosrau II of Persia (590–628)
Year 591 (DXCI) was a common year starting on Monday of the Julian calendar. The denomination 591 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.