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I don't have enough context to write an accurate overview of "398." While you've indicated it relates to a calendar year, I cannot determine which "398" you're referring to (such as a specific historical event, year in a particular calendar system, or other significance) based solely on that information. To provide an accurate, factual overview, I would need more specific details about what aspect of 398 you're asking about.

AI-generated from the Wikipedia summary — may contain errors.