File:Michael_II_and_Theophilos_solidus.jpg · Wikimedia Commons · See Wikimedia Commons
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I don't have enough context to write an accurate overview of "820." While you've indicated the context is "year," I would need to know which specific event, phenomenon, or topic from the year 820 you're asking about. Could you provide more details about what aspect of 820 you'd like me to explain?
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Encyclopedic overview
Emperor Michael II and his son Theophilos
Year 820 (DCCCXX) was a leap year starting on Sunday of the Julian calendar.
Excerpted from Wikipedia’s “820” article, available under the CC BY-SA 4.0 licence.
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