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I don't have enough context to provide an accurate overview of "812." The context you've provided only indicates that "812" relates to a year, but without additional information about what specifically happened in 812, what "812" refers to, or why it would be significant, I cannot write a factually accurate overview.
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Emperor Michael I (c. 770–844)
Year 812 (DCCCXII) was a leap year starting on Thursday of the Julian calendar, the 812th year of the Common Era (CE) and Anno Domini (AD) designations, the 812th year of the 1st millennium, the 12th year of the 9th century, and the 3rd year of the 810s decade.