Helladius
Source cited by John Damascene for the account of Basil's prayer before the image of Our Lady and his vision regarding Julian the Apostate.
Preliminaries
-
TO THE MOST REVEREND AND MOST ILLUSTRIOUS LORD HENRY FRANCIS VAN DER BURCH, ARCHBISHOP AND DUKE OF CAMBRAI, PRINCE OF THE HOLY ROMAN EMPIRE, COUNT OF CAMBRAI.
— Damascene writes "from Helladius" about Basil's prayer before the image of Our Lady
"so Damascene writes from Helladius, in his first Oration On Images"