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Pelagianism received its name from Pelagius and designates a heresy of the fifth century, which denied original sin as well as Christian grace. Africa, where Pelagius and his disciple Celestius had sought refuge after the taking of Rome by Alaric, was the principal centre of the first Pelagian disturbances; as early as 412 a council held at Carthage condemned Pelagians for their attacks upon the doctrine of original sin. Among other books directed against them by Augustine was his famous "De naturâ et gratiâ". Thanks to his activity the condemnation of these innovators, who had succeeded in deceiving a synod convened at Diospolis in Palestine, was reiterated by councils held later at Carthage and Mileve and confirmed by Pope Innocent I (417). A second period of Pelagian intrigues developed at Rome, but Pope Zosimus, whom the stratagems of Celestius had for a moment deluded, being enlightened by Augustine, pronounced the solemn condemnation of these heretics in 418. Thenceforth the combat was conducted in writing against Julian of Eclanum, who assumed the leadership of the party and violently attacked Augustine. Towards 426 there entered the lists a school which afterwards acquired the name of Semipelagian, the first members being monks of Hadrumetum in Africa, who were followed by others from Marseilles, led by Cassian, the celebrated abbot of Saint-Victor. Unable to admit the absolute gratuitousness of predestination, they sought a middle course between Augustine and Pelagius, and maintained that grace must be given to those who merit it and denied to others; hence goodwill has the precedence, it desires, it asks, and God rewards. Informed of their views by Prosper of Aquitaine, the holy Doctor once more expounded, in "De Prædestinatione Sanctorum", how even these first desires for salvation are due to the grace of God, which therefore absolutely controls our predestination.This is volume II of a two volume set containing all of St. Augustine's writings against Pelagianism.