I don't have enough context to write an accurate overview of "321" for a general reader. The single word "year" doesn't provide information about what "321" refers to, what it is, or why it matters. Please provide additional context about what "321" is.
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Roman sun god Sol Invictus
Year 321 (CCCXXI) was a common year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Crispus and Constantinus (or, less frequently, year 1074 Ab urbe condita). The denomination 321 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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).