AI overview
I don't have sufficient context to write an accurate overview of "789." While you've indicated it relates to a year, I cannot provide meaningful information about why that particular year matters without additional context about the region, historical period, or event you're referring to.
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Article
Text of the Admonitio generalis (789)
Year 789 (DCCLXXXIX) was a common year starting on Thursday of the Julian calendar. The denomination 789 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.