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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.

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up vote 5 down vote accepted

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

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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).

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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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