Abner a Jewish rabbi, was born at Buro about 1270. He was converted to Christianity at Valladolid, where he practiced the profession of medicine. From that time he assumed the name of Alphonsus of Burgos, and he distinguished himself by his zeal for the Christian religion. He died in 1346. He wrote a Treatise on the Plague, in Spanish (Cordova, 1551). Before his conversion he had published a work on the agreement of laws, and accompanied his comments with the Commentary of Aben-Ezra upon the ten precepts of the law. After having renounced Judaism, he wrote, in Hebrew, a refutation of the book of rabbi Kimchi against Christians. See Hoefer; Nouv. Biog. Generale, s.v.