
The Christian Church struggles in North Africa as it finds itself facing a resurgent Vandal Arianism. In Ireland, the mission of Palladius seeks to shore up the faith against paganism and Pelagianism.
Links:
Image of Irish Pillar Stone. Photo taken by Jibi44
The Rediscovery of Irish Christianity
Ó Cróinín (2000). “Who was Palladius ‘First Bishop of the Irish’?”. Peritia. 14: 205–37.
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#446 – A History of the Catholic Church – The Bishop of Ireland

As supporters of Cyril of Alexandria and John of Antioch try to sway the emperor and the Roman public to their respective sides, the bishops of Cyril’s synod in Ephesus continue to make decisions about the future of the Church. However, it is increasingly looking like that future will involve a divided Church.
Links:
Mosaic of Council of Ephesus. Photo taken by Palamède
Canons of the Council of Ephesus
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#444 – A History of the Catholic Church – Canons and Deliberations

Emperor Theodosius II decides to call a council in the city of Ephesus in the hopes of making peace between Cyril of Alexandria and Nestorius of Constantinople. Sides are chosen and lines are drawn for the upcoming struggle for the faith.
Links:
Icon of Cyril of Alexandria and the Mother of God.
Pope Celestine I’s letter to the synod of Ephesus
Documents related to the history of the Council of Ephesus
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#442 – A History of the Catholic Church – Preparation for Ephesus

Nestorius finds himself condemned by synods in Rome and Alexandria, but just as things seem to be going Cyril’s way – his Twelve Anathemas drive a huge wedge into the Eastern Church
Links:
Painting of Cyril of Alexandria and the Mother of God. Photo taken by José Goncalves.
Pope Cyril of Alexandria’s Third Letter to Nestorius and the Twelve Anathemas
Pope Celestine of Rome’s letter to Nestorius
Bishop Theodoret of Cyrus’ responses to Cyril’s Anathemas
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#441 – A History of the Catholic Church – Twelve Anathemas

After looking at the Antiochene tradition in Christology, we see how tensions between the Cyril of Alexandria and Nestorius of Constantinople heat up over the appropriateness of calling Mary the Mother of God.
Links:
Icon of Christ. The eyes are said to reflect Christ’s divinity and humanity.
On Theodore of Mopsuestia
More on Theodore of Mopsuestia’s Christology
Comparison between Alexandrine and Antiochine approaches to Christology
The Sub Tuum Praesidium hymn that makes reference to the Theotokos
Cassian’s Seven Books Against Nestorius
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#438 – A History of the Catholic Church – Christotokos