CELESTINE I., pope from 422 t o 432. After his triumph over the dissensions caused by the faction of Eulalius (see BONIFACE I.) his episcopate was peaceful. He instructed Cyril, bishop of Alexandria, to inquire into the doctrines of Nestorius. To extir pate Pelagianism, he sent to Britain a deacon, Palladius, at whose instigation St. Germanus of Auxerre came to inculcate ortho doxy among the clergy of Britain. Celestine also commissioned Palladius to preach the gospel in Ireland which was beginning to rally to Christianity. Celestine was the first pope who is known to have taken a direct interest in Britain and Ireland.
See Duchesne, Lib. Pontificalis, t. I.