The word “Mahzor,” familiar to most Jews as the term used for the prayer book for the High Holidays, means “cycle.” It can therefore be used to describe a book containing any liturgical cycle. Sometimes the term was also used to describe a text created in codex = book form, as opposed to a traditional Jewish scroll.  

The Mahzor Vitry is an 11th-century composition by Rabbi Simcha of Vitry (just south of Paris), a disciple of Rashi, which incorporates texts and directions pertaining to daily prayers, as well as prayers for the holidays and other special days on the Jewish calendar. It also includes liturgical poems, descriptions of messianic times, and legal sections on marriage, holidays, and ritual slaughter, among other topics. The work is the earliest comprehensive record of the practices of Jews in Ashkenaz (at the time, northern France and the Rhineland). 

This manuscript, completed in 1204 is the oldest, most complete surviving manuscript of this work. 

You can see, in the bottom margin of this page, a fleur-de-lis, added to the page early but by an unknown source. The fleur-de-lis was already, by that time, a symbol of the French monarchy, so this image is a reference to the culture where the manuscript was produced, evidence of the comfort of the “artist” in that setting.