JOSEPH B. JACOB ISAAC:
Rabbi at Yampol, Russia, later at Zamoscz; died in 1807. He was the author of "Mishnat Ḥakamim," on various subjects, including Maimonides' "Madda'" (Lemberg, 1792). Appended to the book are some novellæ by his son Isaac, rabbi of Chelm. He refers also to his son's responsa on the laws of Sabbath and festivals, entitled " Otot le-Mo'adim."
- Eisenstadt-Wiener, Da'at Kedoshim, pp. 69-70;
- Fuenn, Keneset Yisrael, p. 469.