Asher ben Jehiel (Hebrew: אשר בן יחיאל, or Asher ben Yechiel, sometimes Asheri) (1250 or 1259 – 1327) was an eminent rabbi and Talmudist best known for his abstract of Talmudic law. He is often referred to as Rabbenu Asher, “our Rabbi Asher” or by the Hebrew acronym for this title, the Rosh (רא"ש‎). His yahrzeit is on 9 Cheshvan. Source: Wikipedia (en)