Horowitz, Isaiah, I. Horowitz, Rabbi I. Horowitz

Isaiah Horowitz or Yeshayahu ben Avraham Ha-Levi Horowitz (Hebrew: ישעיה בן אברהם הלוי הורוויץ) (c. 1555 – March 24, 1630), also known as the Shelah HaKaddosh (השל"ה הקדוש 'the holy Shelah') after the title of his best-known work, was a prominent rabbi and mystic.