Biennial -sg that happens every alternate year.
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It is biennial.
Annal
The adjective is quadrennial. (extension of 1-annual, 2-biennial, 3-triennial) (The archaic word for a five-year period is a lustrum.)
Year 1000 was a medieval word. It was approximately in the middle of the Middle Ages. It starts with the letter Y.
There is no word for a 225th year of anything. However there are some names for 200th and 300th years. Bicentenary , Bicentennial - 200th anniversary. Tercentenary, Tercentennial, Triennial - 300th anniversary.