Yahrtzeit of Rabbi Yaakov Ben Meir Tam (1100-1171), talmudic commentator known as Rabbeinu Tam. A grandson of Rashi, Rabbeinu Tam was the greatest sage of his time, and Jews flocked to his academy in France to hear his Talmudic discourses. These lectures served as the basis for the Tosfot commentary, which was compiled by his students and today is printed on every standard page of the Talmud. Rabbeinu Tam was an extremely successful wine merchant and financier. When his home was attacked by Crusaders in 1146, he was stabbed repeatedly in the head, and dragged out to a field to die. He miraculously survived, and lived another 25 years.