MARGOLIES, ISAAC BEN ELIJAH (1842–1887), Polish rabbi and author. Born in Kalvarija, S.W. Lithuania, the son of a rabbi, Margolies devoted himself in his early youth solely to talmudic studies. After his marriage in 1862 to the daughter of a prominent member of the community of Merech in Vilna province, he took up residence there and began to take a keen interest in the Haskalah. This interest aroused the hostility of anti-Haskalah zealots, which, together with reverses in his father-in-law's business, compelled him to seek employment elsewhere. After spending some 15 years as a teacher, particularly in the house of Ezekiel Jaffe in Kovno, Margolies was appointed rabbi of Druskinnikai in Grodno province. There too he was persecuted by the opponents of the Haskalah, and two years later he accepted the invitation of the congregation of Anshei Kalvarija in New York, where he became renowned as a public lecturer and teacher. Margolies is the author of two works, Ma'oz ha-Talmud (1869) and Ma'oz ha-Yam (1871), in
Ha-Asif, 4 (1887), 72–74 (first pagination); American Hebrew, 32 no. 1 (Aug. 12, 1887), 8.