Karaite scholar; lived at Krasnoi-Ostrog, Poland, in the seventeenth and eighteenth centuries. He studied under Joseph ben Samuel, ḥazzan of Kalisz, and David ben Shalom ha-Zaḳen, and at an earlyage became proficient both in rabbinical and in Karaite literature. Mordecai is chiefly known through his work "Dod Mordekai" (Vienna, 1830), written in answer to four questions addressed in 1698 to David ben Shalom ha-Zaḳen by Jacob Trugland, professor of theology at the University of Leyden. These four questions were: (1) Is the Karaite sect identical with that which existed at the time of the Second Temple under the name "Sadducees," or did it originate with Anan, as the Rabbinites assert? (2) Was Aquila, the proselyte, to whom Menahem Ḳala'i had addressed letters, identical with the Greek translator or with the author of the Targum? (3) Is the "Moreh Aharon" identical with the "Sefer ha-Miẓwot" of Aaron ben Elijah of Nicomedia; if not, who was its author? (4) Has the Karaite Bible any variants from the Rabbinite Bible, and what is the prevailing belief among the Karaites with regard to the time of the introduction of vowels and accents?

Mordecai divided his work into twelve chapters, each of which bears the name of a Jewish tribe. To the first question he answered that, although the Karaite sect is not identical with that of the Sadducees, it nevertheless existed at the time of the Second Temple. He divided the history of the Karaites into three epochs: the first beginning with the formation of a separate congregation without any external distinction from other congregations, in the time of Simeon ben Sheṭaḥ; the second beginning with Anan, who made an open stand against the Talmudists; and the third beginning with the fourteenth century, when the first traces of the decline of Karaism began to be felt. The second question is left unanswered. The name "Menahem," he says, is nowhere to be met with except in the "Mibḥar," and there is, therefore, no information concerning his personality. As to the author of the Targum, Mordecai knows him only through the Rabbinite authorities. The third question is answered satisfactorily, and Mordecai gives by the way information of the Karaite works found in Poland. The Karaite Bible, he says, in answer to the fourth question, does not vary from that of the Rabbinites; and the vowels and accents are believed to have been transmitted to Moses on Mount Sinai. Here Mordecai cites Azariah dei Rossi and displays a vast knowledge of rabbinical literature.

In addition, Mordecai wrote: "Sefer Ma'amar Mordekai," a commentary on the "Mibḥar" of Aaron ben Joseph; "Derek ha-Yam," dissertation on a passage of the "Mibḥar" to Gen. ix. 21; "Kelalim Yafim," an elementary Hebrew grammar; "Yad Adonai," the subject of which is not known; "Lebush Malḳut," on the differences between the Rabbinites and the Karaites; liturgical poems, some of which have been inserted in the Karaite ritual.

  • Jost, Gesch. des Judenthums und Seiner Sekten, ii. 371 et seq.;
  • Fürst, Gesch. des Karäert. iii. 87 et seq.;
  • Neubauer, Aus der Petersburger Bibliothek, pp. 76 et seq.
S. I. Br.
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