Yosef ben Asher of Chartres was born in the second half of the 12th century and a paytan active in France. Joseph was a disciple of Rabbeinu Tam and of Rashbam. He is cited in the "Semag" of Moses of Coucy (Prohibition 113) in connection with the ordinance forbidding the descendants of Ammon and of Moab to enter the Jewish community. He composed an elegy commencing with the words , on the massacre of the Jews of York, England, in 1191. He is doubtless identical with the Bible commentator Joseph me-Karṭesh. He was the brother-in-law of Joseph b. Nathan of Etampes, and great-uncle of the author of "Joseph le Zélateur." The latter reports in that work (No. 24) a discussion which Joseph had with an ecclesiastic. "A monk asked R. Joseph of Chartres why God had manifested Himself in a bush rather than in a tree. Joseph answered: 'Because it is impossible to make an image [crucifix] thereof.'"