Rabbeinu Tam

Yaakov ben Meir, known as Rabbeinu Tam ('Our Rabbi the Perfect'), was a leading French Tosafist of the twelfth century and the grandson of Rashi. Born in Troyes around 1100, he became the most influential halakhic authority of northern France and a towering figure in Ashkenazi Jewry. Rabbeinu Tam founded a major yeshiva and was renowned for his incisive analytical method, which he applied to reconciling seemingly contradictory talmudic passages and refining halakhic rulings. He authored extensive Tosafot (critical glosses on the Talmud) and was consulted by rabbinic communities across Europe on difficult legal questions. His interpretative innovations shaped Ashkenazi Torah study for centuries. He died in Troyes around 1171, widely mourned as a loss to the Jewish people.