AI overview
I don't have enough context to write an accurate overview of "856." The context provided only indicates that "856" relates to a year, but without additional information about what specifically occurred in 856 or why it's significant, I cannot provide an accurate and factual summary as requested.
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Article
Rabanus Maurus (left) presents his work to archbishop Odgar of Mainz (right)
Year 856 (DCCCLVI) was a leap year starting on Wednesday of the Julian calendar.