a Campanian by birth, the successor of Pope Bonifacius I., was ordained bishop of Rome on the 10th of September, A. D.
812423, and retained this dignity until his death, in the month of July, 432. He was distinguished by the activity which he displayed in seconding the exertions of Cyril for procuring the deposition of Nestorius and the condemnation of his doctrines at the council of Ephesus in 431, and by the earnestness with which he strove to root out the Semipelagianism of Cassianus [CASSIANUS] from Gaul, Italy, and Britain. We must not omit to observe, that during this pontificate the jurisdiction of the Roman see was formally disowned by the clergy of Africa, who refused to admit the right of any transmarine ecclesiastic to interfere with the proceedings or alter the decrees of their synods. According to Prosper, Palladius, the first bishop of Scotland, which probably means Ireland, was consecrated by Coelestinus.[W.R]