About “Machzor Vitry”
Machzor Vitry was compiled by Simhah ben Samuel of Vitry, a French Talmudist of the 11th and 12th centuries and a pupil of Rashi. Simhah ben Samuel lived in Vitry-en-Perthois. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.