Isaac ben Abraham (יצחק בן אברהם), also called Rabbi Isaac ha-Baḥur (Hebrew: ר"י הבחור or רבי יצחק הבחור, which translates to "Rabbi Isaac the Younger") and by its Hebrew acronym RIBA (ריב"א) or RIẒBA (ריצב"א), was a tosafist of the late twelfth and early thirteenth centuries.
He succeeded his teacher Isaac ben Samuel as head of the school of Dampierre, after which place he is often called,[1] as well as by the epithet Isaac ha-Baḥur ("the younger"), to distinguish him from his teacher, Isaac ben Samuel ha-Zaḳen ("the elder") (ר"י הזקן).
| Rabbi Isaac ben Samuel (R"I) | Rabbeinu Tam | ||||||||||||||||||||
| Isaac ben Abraham of Dampierre | |||||||||||||||||||||
| Judah ben Yakar | Samuel ben Elhanan | Natan ben Meir | |||||||||||||||||||