Crossword Genius

Date to beware, according to a Shakespearean soothsayer (4)

Ross

I believe the answer is:

ides

(Other definitions for ides that I've seen before include "Side of March when Caesar died" , "Roman monthly date" , "Day in Roman months" , "March day fatal to Julius Caesar" , "For example, March 15 in the Roman calendar" .)

I've seen this clue in The Wall Street Journal.
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