Nothing is known about this presbyter mentioned by Gennadius; The introductory treatise on the nature of things did not survive. Hhe may perhaps be associated with Presbyter Heliodorus, a companion of Hilary of Poitiers, who is mentioned by Jerome in his letter 34 to Marcella. In this letter, Jerome argues with Heliodorus about his interpretation of a certain psalm. Judging from this letter, Heliodorus from Poitiers was active at least between 360 and 368. This fact reinforces the claim that these two Heliodoruses could be identified as the same person: in Gennadius work, organised in roughly chronological manner, Heliodorus' entry is located between Macrobius' and Pachomius', who were indeed active in this period.