File:Solidus_Constantius_III-RIC_1325.jpg · Wikimedia Commons · See Wikimedia Commons
AI overview
I don't have enough context to write an accurate overview. The term "421" could refer to many things (a law, regulation, historical event, mathematical concept, etc.), and you've only provided "year" as context, which isn't sufficient to determine what "421" means or why it matters. Could you provide more information about what "421" refers to?
AI-generated from the Wikipedia summary — may contain errors.
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