Letter 1

Agapetus IUnknown|pope agapetus i
From: Pope Agapetus I, Bishop of Rome
To: Emperor Justinian I
Date: ~535 AD
Context: Agapetus congratulates Justinian and makes the case for orthodox theology — this pope famously traveled to Constantinople and convinced Justinian to depose the Monophysite Patriarch Anthimus.

Agapetus, bishop, to the most victorious and pious Emperor Justinian.

We rejoice, most venerable emperor, that your reign has been marked from its beginning by a commitment to the orthodox faith, and we write to express what we hope will be a long collaboration between the apostolic see and the imperial court in the service of that faith.

The theological situation in the East requires, I must speak plainly, more decisive action than has yet been taken. The patriarch Anthimus of Constantinople has been received into his position through a process that was not canonical, and his theology, on the question of Christ's natures, is not orthodox. He does not accept the Chalcedonian definition. A patriarch who does not accept Chalcedon cannot serve as a partner in the defense of Chalcedonian orthodoxy.

I am prepared to come to Constantinople myself to discuss this matter, if Your Piety believes that my presence would be useful. The bishop of Rome is not accustomed to such journeys, but the importance of the question justifies extraordinary measures.

What I ask: that Anthimus be replaced by a bishop who holds the Chalcedonian faith unambiguously, and that the see of Constantinople return to the full communion with Rome that was restored after the Acacian Schism.

With the highest respect for your person and your office,
Agapetus, bishop of Rome

Modern English rendering for readability. See the 19th-century translation or original Latin/Greek for scholarly use.