The Trinitarian Doctrine of Isidore of Pelusium

The correspondence of Isidore of Pelusium (360–435/440?), which consists of approximately two thousand letters, deals to a considerable extent with spiritual teachings and biblical exegesis and to a lesser degree with theological subjects. This article focuses specifically on Isidore’s Trinitarian doctrine and aims to bring to light its sources. The examination of the predominant anti-Arian and anti-Neo-Arian arguments and of the biblical passages Isidore deployed to support his doctrinal points illustrates two aspects of interest: on the one hand, it reveals Isidore as a derivative representative of Neo-Nicene orthodoxy acquainted with different anti-Anomoean works; on the other hand, it confirms the well-established view that Isidore was a resourceful and cultivated exegete.