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I don't have sufficient context to write an accurate overview of "826." The context provided only indicates that "826" relates to a year, but without additional information about what specific aspect, event, or topic associated with the year 826 you're asking about, I cannot write an accurate and factual overview.
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Theodore the Studite (759–826)
Year 826 (DCCCXXVI) was a common year starting on Monday of the Julian calendar, the 826th year of the Common Era (CE) and Anno Domini (AD) designations, the 826th year of the 1st millennium, the 26th year of the 9th century, and the 7th year of the 820s decade.