Yitzchak Yaakov Yellin (, Isaac Jacob Yellin; 1885–1964) was one of the pioneers of the Hebrew language and press in Mandatory Palestine and then Israel. He was one of the founders and editor of the daily newspaper "Moriah", as well as the editor of the weekly newspapers "Lefi Sha'a", "Be'inyaney Dyuma", and "Hed ha'am". Yellin published Hebrew grammar books and was known as an educational figure who widely contributed towards the spread and use of the Hebrew language in Jerusalem of the early 20th century. He was also one of the founders of the Kiryat Moshe neighborhood in West Jerusalem. Biography Yellin was born in the Old City of Jerusalem to a family of biblical grammarians. His grandfather, Rabbi Shalom Shachne Yellin, who was known as "The Proofreader of Skidl", was regarded as one of the proofreaders of the most popular Torah books in the world, and his name is connected to the notes and commentary of the Aleppo Codex (Keter Aram Zoba) of Ben Asher. His uncle, Aryeh Leib Yellin, most known as the author of the Yefeh 'Enayim parallel passages of the Talmudic text, was a Polish rabbi. His father, a proofreader and Torah scribe, known by the alias Zvi Hirsch Sofer, was one of the founders of the Mishkenot Yisrael neighborhood in Jerusalem. Yitzchak Yaakov Yellin married Lea Miriam, the daughter of Rabbi Meshulam Zalman Shapira, the son of Rabbi Haim Yaakov Shapira, the head of the Rabbinical Law Court of Jerusalem. Already at 17 years of age, Yellin began publishing a weekly newspaper that was called The Zionist, in which he called upon the spreading of the Zionist idea and its adaptation by the Jewish Ultra-Orthodox wing, which he himself was part of. In "The Zionist", which was distributed in yeshivas (Talmudic colleges) in Jerusalem, Yellin preached, among others, for Zionist achievements and the need of yeshiva students to join the work force. In 1910, with the establishment of the "Moriah" newspaper, Yellin was appointed as its chief editor and stayed in that role during all the years of the newspaper's life. During these years Yellin also wrote a substantial amount of the newspaper's articles. "Moriah" was closed in 1915, during World War I, under a decree of the Turkish authorities, after Yellin refused to follow the decree that forbade newspapers to write about political issues. Among the other newspapers that Yellin wrote, edited and published,