Avitus was praetorian prefect and consul in 423 He is mentioned in the Gesta de purgatione Xysti III episcopi' in a list of aristocrats involved in the investigations against Pope Sixtus III. Although the Gesta has been long recognized as a later forgery, B.L. Twyman argued in 1970 that the list of aristocrats was taken from a later papal investigation concerning the deposition of bishop Celidonius by archbishop Hilarius of Arles. T.D. Barnes subsequently showed that the list was best explained as the product of "a writer of the sixth century [who] has deliberately mixed genuine and fictitious persons."
He had a wife, Anastasia, and a son, Rufius Praetextatus Postumianus (consul in 448); it is possible that Rufius Viventius Gallus was another son. Marinianus and his wife were Christians; at Pope Leo I's request, they restored the mosaic on the façade of the Old St. Peter's Basilica, as recorded by an inscription on the mosaic itself.
- Codex Theodosianus, 3.5.12.
- CIL III, 3104.
- Twyman, "Aetius and the Aristocracy", Historia 19 (1970), pp. 494ff
- Barnes, "'Patricii' under Valentinian III", Phoenix, 29 (1975), pp. 163ff
- CIL VI, 1761, dated 448, when Marinianus was probably still alive.
- Louise Ropes Loomis, The Book of the Popes (Liber Pontificalis) I-: To the Pontificate of Gregory I, BiblioBazaar, LLC, 2009, ISBN 1-103-32336-9, p. 100.
- Jones, Arnold Hugh Martin, John Robert Martindale, John Morris, The Prosopography of the Later Roman Empire, Volume 2, Cambridge University Press, 1992, ISBN 0-521-07233-6, pp. 723–724.
Imp. Caesar Honorius Augustus XIII,
Imp. Caesar Flavius Theodosius Augustus X
|Consul of the Roman Empire
with Flavius Asclepiodotus