Rabbi of Smyrna toward the end of the seventeenth century. He corresponded with Ḥayyim Benveniste, author of "Keneset ha-Gedolah," whom Jacob seems to have succeeded in the rabbinate of Smyrna. Jacob was the author of "Mishkenot Ya'aḳob" (Salonica, 1721), homilies on the Pentateuch and other subjects, followed by a pamphlet entitled "Ẓenif Melukah," on the obligations of subjects to their king a responsa collection entitled "Zera' Ya'aḳob," followed by a collection of sermons bearing the title "Yeshu'ot Ya'aḳob," Leghorn, 1784. Zedner ("Cat. Hebr. Books Brit. Mus." p. 2) attributes the last two works to a different author, whom he calls Jacob Ḥayyim ibn Na'im but Benjacob attributes them to Joseph ibn Na'im.