Dictionary of Greek and Roman Biography and Mythology/Helpidius 3.
3. A friend of Symmachus. A considerable number of the extant letters of Symmachus were addressed to him, and owe their preservation to the care of Helpidius. (Symmach. Epist. v. 83, 84, ed. Genev. 1587, v. 85, 86, ed. Paris, 1604; Tillemont, Hist. des Emp. vol. v. p. 409.) [J.C. M.]