Enter a clue or pattern or both:
The Clue
M years before the Battle of Hastings (4 letter answer)
The Answer
LXVI
Tags
Notes
The answer LXVI is so rare that it appears less than once every 2500 puzzles.
Definition
LXVI as an adjective:
1. (sixty-six, 66, lxvi) = being six more than sixty