3 surviving letters between Eusebius, Archbishop of Thessalonica and Gregory of Nazianzus.
Epistle 16. To Eusebius, Bishop of Cæsarea. Since I am addressing a man who does not love falsehood, and who is the keenest man I know at detecting it in another, however it may be twined in skilful and varied labyrinths; and, moreover, on my own part I will say it, though against the grain I do not like artifice, either, both from my natural co...
Epistle 17. To Eusebius, Archbishop of Cæsarea. I did not write in an insolent spirit, as you complain of my letter, but rather in a spiritual and philosophical one, and as was fitting, unless this too wrongs your most eloquent Gregory.
Epistle 42. To Eusebius, Bishop of Samosata. (There still seemed a probability that intrigues and party spirit would carry the day, and so the two Gregories determined to call in the aid of Eusebius of Samosata, though he did not belong to the Province.