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[[Image:0408celestine-rome.jpg|thumb|right|Saint Celestine, Pope of Rome]]
Saint Celestine, a zealous champion of Orthodoxy, lived during the reign of the holy Emperor Theodosius the Younger (408-450). He received an excellent education, and he was known for his extensive knowledge of the [[Holy Scripture]] and his theological ponderings.
The virtuous life of the
[[saint ]] and his authority as a [[theologian]] won him the general esteem and love of the [[clergy]] and people. After the death of St Boniface I, St Celestine was chosen to be the [[Bishop]] of [[Church of Rome|Rome]].
A strong character, Saint Celestine was active against [[pelagianism]], he sent St. Germanus of Auxerre to Britain and St. Palladius to Ireland.
During this time, the
[[heresy ]] of [[Nestorius]] emerged. At a local Council in Rome in 430, St Celestine denounced this heresy and condemned Nestorius as a [[heretic]]. After the Council, St Celestine wrote a letter to St [[Cyril of Alexandria|Cyril, Archbishop of Alexandria]] ([[January 18]]), stating that if Nestorius did not renounce his false teachings after ten days, then he should be deposed and excommunicated.
St Celestine also sent a series of letters to other churches, [[Constantinople]] and [[Antioch]], in which he unmasked and denounced the Nestorian heresy.
For two years after the Council, St Celestine proclaimed the true teaching about [[Christ]] the God-Man, and he died in peace on April 6, 432.