Yaaqov Ḳoppel ben Tsvi Margoliyot

Yaakov Koppel ben Tsvi Margoliyot (d. 1673(?)) was Polish preacher and moralist of the 17th century. He came from Vladimir, Volhyṇia, where he was an eye-witness of the massacres of 1648-49, from which he escaped to Germany. He was the author of Mar'ot Ya'aḳob, tables of ethical rules (Venice, 1662); Mizbaḥ Ya'aḳob, a sermon on penitence and some haggadic novellæ (ib. 1662); and Ḳol Ya'aḳob, on the Pentateuch and the Talmud, to which is appended an elegy on the victims of the above-mentioned massacres (Amsterdam, 1708). (via this article in the 1906 Jewish Encyclopedia)