Archbishop of Seville; flourished in the sixth and seventh centuries. He presided over the fourth Council of Toledo, called together by the Visigothic king Sisenand (633), and gave expression to the principle that Jews ought not to be forced into the Christian Church. To convert the Jews he wrote a book in two volumes, "Contra Judæos," in which he takes care to maintain the claims of Christianity from the Old Testament. Whether the Spanish Jews entered into controversy with Isidorus, and, as Grätz believes, carried it on in Latin, is an open question.

Bibliography: Grätz, Gesch. der Juden, v. 77 et seq.J. M. K.