רבי מאיר בן שמואל מרמרו היה מראשוני בעלי התוספות, תלמידו וחתנו של רש"י. נקרא "אבי הרבנים" כיוון שבניו היו רבנים חשובים.
Meir ben Samuel, also known by the Hebrew acronym RaM for Rabbi Meir, was a French rabbi and tosafist, who was born in about 1060 in Ramerupt, and died after 1135. His father was an eminent scholar. Meir received his education in the Talmudical schools of Lorraine, his principal teachers being Isaac ben Asher ha-Levi and Eleazar ben Isaac of Mainz, with whom he later carried on a correspondence.
On Wikipedia: עברית · English — summary from Wikipedia, CC BY-SA