theologian. Prosper Tiro of Aquitania was living at Marseilles when the Semipelagian controversy broke out (426). He wrote to St Augustine, and in 431, after Augustine's death, he went to Rome to secure Celestine I's support for Augustinian teaching. From his writings it seems that Prosper's theological views developed from the rigid Augustinianism of his earlier controversial works to a milder view which rejected predestination to damnation and affirmed the will of God to save everyone, though believing in the reprobation of a great number. In the last period of his life he was closely associated with Leo V. Feast day, 7 July.
Subjects: Christianity — classical studies.