Edited by Rabbi Avraham Shoshana and Rabbi Yehuda Amitai Shoshana. Edited for the first time from MS Moscow Guenzburg 636, with scholarly introductions, references, notes and full commentary, and detailed indices of sources and subjects. A Tosafot compilation of the 'lengthy genre', representing material never known before, emanating from the academy of R. Isaac b. Shemuel of Dampierre (R"L the Elder), founder of the Tosafot and written by his disciple. Utilized by rishonim (Ramban, Rid, Ritva, etc.), and indeed is the basis for the composition of 'our' Tosafot and Tosafot ha-Rosh.