Between 425 (year in which he was made patricius) and 429 he served as magister utriusque militae in defense of Italy, but despite a brief mention of one of his military actions in the Notitia Dignitatum, his subordinates Bonifacius and Aetius were considered more significant in this regard.
In Ravenna, a powerful ruler was missing, because the emperor Valentinian III was a minor and the empire was ruled by his mother Galla Placidia.
Although he acquires the pretentious function of particius in 430, he seems to have lost his grip on the army when Aetius is appointed by Galla Placida as magister equitum praesentalis, an equivalent military rank.
The promotion of Felix by Galla Placidia to patrician in 430 cannot be seen as a reward for his efforts to neutralize the danger that Boniface posed (which was actually a failure), but to prevent even more envy by the growing power of Aetius who was now equivalent in rank.
We see the same pattern as the imperial government orders Aetius to cease the campaign in Gaul, to go with his troops to Italy to prepare with Felix in the war against the Vandals.
[10] According to a recent reconstruction of his familial bonds, he was an ancestor of Arcadius Placidus Magnus Felix, consul in 511, and a son of Ennodius.