Nathan ben Yeḥiel of Rome (ca. 1035-1110) was one of the most important talmudic scholars of his day, known above all for his Arukh, a massive and comprehensive dictionary of the famously difficult language of the Talmud—a work written in a mixture of Hebrew and Aramaic with heavy doses of Greek and Persian. Not satisfied merely to define words, Nathan compiled a great deal of other reference information for each entry, creating a work unlike anything that preceded it. Henry Abramson, after a swift survey of Roman Jewish history in the first millennium, tells what is known of Nathan’s life and work. (Video, 50 minutes.)
Read more on Lectures in Jewish History and Thought: https://henryabramson.com/2019/03/05/who-was-natan-of-rome-jews-of-italy-pt-v/