YAḲḲAR BEN SAMUEL HA-LEVI I.:
German scholar of the eleventh century; lived for a short time in Speyer. He was a pupil of Kalonymus of Rome, and questions addressed by him to Kalonymus have been preserved ("Shibbole ha-Leḳet," viii.); several of these referred to a custom observed among the Jews of Speyer only. The same subject is treated by Mordecai ("B. M." ix.).
- Kohn, Mordekai ben Hillel, pp. 126, 127, and notes, Breslau, 1878;
- Fuenn, Keneset Yisrael, pp. 669-670;
- Gross, Gallia Judaica, p. 567.