Who knows two hundred fifty-one?

Please cite/link your sources, if possible. At some point at least twenty-four hours from now, I will:

  • Upvote all interesting and relevant answers.

  • Accept the what I think is the "best" answer.

  • Go on to the next number.

Back to hard ones, a prime in this case.


There were 251 years from Avraham's birth to Yosef's.


The coming Shavuos (first day outside Eretz Yisrael, only day in it) marks 251 years since the passing of the Baal Shem Tov (in the year 5520/1760).


From 1805 to 1855 (which are apparently the years for which records are available), the London bes din converted 251 minors who had Jewish fathers. (Source.)

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