of his writings have been preserved: His primary work, Or Adonai, The Light of the Lord. An exposition and refutation of the main doctrines of Christianity. This treatise was written in Catalan in 1398. The Catalan original is no longer extant; but a Hebrew translation by Joseph ibn Shem-Tov, with the title ("Refutation of the Cardinal Principles of the Christians"), has been preserved. The work was composed at the solicitation of Spanish noblemen. Crescas' object in writing what is virtually an apologetic treatise on Judaism was to present the reasons which held the Jews fast to their ancestral faith. His letter to the congregations of Avignon, published as an appendix to Wiener's edition of "Shevet Yehudah" (see above), in which he relates the incidents of the persecution of 1391. List of works The Light of the Lord (Hebrew: Or Adonai or Or Hashem) The Refutation of the Christian Principles (polemics and some philosophy) Daniel Lasker: Sefer Bittul Iqqarei Ha-Nozrim by R. Hasdai Crescas. Albany 1992. Carlos del Valle Rodríguez: La inconsistencia de los dogmas cristianos: Biṭṭul 'Iqqare ha-Noṣrim le-R. Ḥasday Crescas. Madrid 2000. Passover Sermon (religious philosophy and some halakha) References Further reading Harry Austryn Wolfson, Crescas' Critique of Aristotle. Cambridge, Harvard University Press, 1929. Warren Zev Harvey, Physics and Metaphysics in Hasdai Crescas, Amsterdam Studies in Jewish Thought, J.C. Gieben, Amsterdam, 1998. Warren Zev Harvey, Great Spirit and Creativity within the Jewish Nation: Rabbi Hasdai Crescas(Hebrew), Mercaz, Zalman Shazar, Jerusalem 2010. External links 1340 births 1410s deaths 14th-century Catalan rabbis 14th-century Spanish philosophers 14th-century Jewish theologians 15th-century Catalan rabbis 15th-century Spanish philosophers Determinists Jewish apologists Jewish philosophers Medieval Catalan-language writers Philosophers from Catalonia Philosophers of Judaism Writers from Barcelona