Same Power conferred on all the Apostles.—Roman Church not the First Established.—Ancient Churches Equal.— Leo I. Great and Ambitious. His Interviews with Attila and Genseric.—Persecution of Priscillian.—Rival Popes.— Belisarius seized Rome, and made Vigilius Pope.—Pope Silverius put to Death.—Vigilius and Justinian.—The “Three Chapters.”—Popes elected with Emperor’s Consent.—Gregory I.