Meir ben Barukh of Rothenburg

Meir of Rothenburg (c. 1215 – 2 May 1293) was a German Rabbi and poet, as well as a major contributing author of the tosafot on Rashi's commentary on the Talmud. He is also known as Meir ben Baruch (Hebrew: מאיר ב"ר ברוך‎), and by the Hebrew language acronym Maharam of Rothenburg ("Our Teacher, Rabbi Meir", Hebrew: מהר"ם מרוטנבורג‎). He was referred to by Rabbi Menachem Meiri as the "greatest Jewish leader of Tsarfat (Medieval Hebrew for France, a reference to Charlemagne's rule of Germany)" alive at the time.

https://en.wikipedia.org/wiki/Meir_of_Rothenburg