of the Koran into Western languages, Castilian, with the assistance of an Islamic scholar: ʿĪsā ibn Jābir (عيسى بن جابر). He died in 1458. Writings His most important literary work is an extensive history of the Council of Basle, written 1449-1453. His other works are: a treatise in favour of the Immaculate Conception of our Lady, printed at Brussels in 1664 a refutation of the Koran, entitled "De mittendo gladio in Saracenos" a defense of the "Filioque" against the Orthodox entitled "De processu Spiritus Sancti" (Basle, 1476) a Biblical concordance, "Concordantiae biblicae vocum indeclinabilium" (Basle, 1476) a few works defending the superiority of a general council over the pope. Sources Notes Further reading Spanish Christian theologians 15th-century Castilian Roman Catholic priests 15th-century Spanish writers Academic staff of the University of Salamanca Spanish–Latin translators