Enter a clue or pattern or both:
The Clue
First year in St. Pius I's papacy (3 letter answer)
The Answer
CXL
Tags
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