Enter a clue or pattern or both:

The Clue

First year in St. Pius I's papacy (3 letter answer)

The Answer

CXL

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Notes

The answer CXL is so rare that it appears less than once every 2500 puzzles.

Definition

CXL as an adjective:

1. (one hundred forty, 140, cxl) = being ten more than one hundred thirty