8 surviving letters between Eustathius and Isidore of Pelusium, spanning 425 AD.
“To Eustathius, a deacon.”
“To Eustathius.”
“To Eustathius On gluttony.”
“On gluttony.”
“To Eustathius the presbyter.”
“216.”
“217.”
“To Eustathius, presbyter.”