Answer:
   
   Rabbi Shlomo Ben Yitzchak, 1040-1105. Usually called Rabbi Shlomo
   Yitzchaki. He was the author of a massive commentary on almost all of
   Tanach and most of the Talmud. His fame rests not only on the content
   of his explanations but on their style that remains clear and concise
   throughout. His commentary has become the most comprehensive and
   popular in existence and provided the basis for most subsequent
   studies of the Tanach, Talmud, and Jewish Law.
   
   His commentary on Chumash, first printed in 1465, was the first dated
   Hebrew book, and appears in a special script now know as "Rashi
   script". His commentaries are considered the standard work without
   which it is impossible to understand the Talmud.
   
   See also: [5]Section 3.18. Torah: What is Rashi's commentary on the
   Talmud?