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In page Meshulam Gross:

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It is not known which yeshivas he attended, although it is believed[by whom?] that much of his Torah learning was self acquired. In 1890 he married Leah Billiczer, daughter of Rabbi Amram Yishai Halevi Billiczer, Av Beth Din of Szerencs, Hungary, and a descendant of a long line of rabbis. The family originally came from Spain and reportedly were descendants of Rabbi Isaiah Horowitz (the Shelah HaKadosh, whose ancestry has been traced to Rashi and Rabbi Yochanan Hasandlar.