In the 4th and 5th centuries, Gothic invaders terrorized the Roman Empire, sacking Rome and establishing a Gothic kingdom in Spain. St. Isidore, archbishop of Seville, set out to convert the various peoples of the Gothic Empire to Christianity, eventually eradicating the Visigoths’ religion of Arianism. Later hailed by the Church as “the most learned man of the latter ages,” Isidore was the first Christian writer to compose a compendium of universal religious knowledge. What was it called? Discuss