Didymus

Didymus is known only as a correspondent of Isidore of Pelusium (d. c. 450), to whom Isidore addressed a substantial run of letters in the early-to-mid 5th-century milieu of Pelusium and the eastern Nile Delta. The address honorific is consistently "presbyter" (e.g. "To Didymus, presbyter" and "To Didymus the Presbyter"), and the bulk of the surviving letters answer scriptural questions he evidently put to Isidore, expounding verses such as "I and the Father are one" (John 10:30), "Your eyes saw my unformed substance" and "My bone was not hidden" (Psalm 138 LXX), and "A longsuffering man is great in understanding" (Proverbs 14:29) — marking him as a clergyman engaged in biblical exegesis and trinitarian discussion. Other letters to him touch on ecclesiastical strife, unworthy ordination, and reproach of treacherous adversaries, suggesting Isidore also treated him as a confidant in church disputes. (One letter is addressed to a "Didymus the Scholasticus," an advocate, who may or may not be the same man; he is otherwise unattested outside this correspondence.)