Celestine of Rome

Today, we commemorate Celestine of Rome. According to Orhthodox Wiki:

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 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, 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.