AI overview
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.
AI-generated from the Wikipedia summary — may contain errors.
Article · 日本語
321年（321 ねん）は、西暦（ユリウス暦）による、平年。
Abstract from DBpedia / Wikipedia · CC BY-SA