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R. Berechiah b. Natronai Ha'Nakdan (end of 12th–13th century), fabulist, translator, thinker, copyist, and grammarian. Berechiah lived in Normandy and at a certain period also in England. His title ha-Nakdan testifies to the fact that he punctuated Hebrew books. He also knew foreign languages and translated and adapted several books into Hebrew, including Quaestiones Naturales by Adelard of Bath, a popular 12th-century book on natural sciences. Berechiah entitled it Dodi ve-Nekhdi or Ha-She'elot (ed. by H. Gollancz, 1920). His collections of ethical treatises Sefer ha-Hibbur and Sefer ha-Mazref (ed. by Gollancz, The Ethical Treatises of Berachyah, son of Rabbi Natronai Ha-Nakdan, 1902) summarized the opinions expressed in R. Saadiah Gaon's Emunot ve-De'ot (of which Berechiah used the old, unprinted translation in Hebrew), as well as the opinions of other geonim. In these essays he invented several Hebrew terms for philosophical concepts. He also wrote Ko'ah Avanim (unpublished), a translation-adaption of a Latin book about the magical powers in stones