Domitius Modestus (floruit 358-377) was a politician of the Roman Empire.
Of Arab origin, Modestus was comes Orientis from 358 to 362, succeeding to Nebridius and serving under the Emperors Constantius II and Julian. In 359 he was the president of a commission at Scythopolis, and in this office he judged with cruelty the defendants.
Under Emperor Valens he was Praetorian prefect of the East (369-377) and consul in 372. During his office as Praetorian prefect he completed the building of the Cisterna Modestiaca (a cistern identified with Sarrâdshchane), whose building was begun by the architect Helpidius in 363, while Modestus was praefectus urbi.
In 371 was appointed president of a commission that was to judge some high officers who had been accused of practicing magic, in particular of having consulted a soothsayer to learn the name of the successor of Emperor Valens. Modestus acted very cruelly, torturing innocent people, thus extorting confessions from them. His consulate, the following year, was probably a reward for his handling of the process.
Despite the fact that he was strongly connected with the pagan officers and had been a pagan under the pagan Emperor Julian, under Valens he converted to Arianism, the Emperor's religion. Valens sent Modestus to meet the Nicene bishop Basil of Caesarea, to mediate between the two opposing Christian faiths, but Basil refused. Modestus was then ordered by Valens to use violence against the bishop, but he did not.
He is the addressee of 37 letters by Libanius.
- Burns, Paul (ed.), Butler's Lives of the Saints: New Full Edition January. The Liturgical Press. ISBN 0-8146-2377-8.
- Jones, Arnold Hugh Martin, John Robert Martindale, John Morris, Prosopography of the Later Roman Empire, volume 1, Cambridge University Press, 1992, ISBN 0-521-07233-6, pp. 605-08
Gratian Augustus II
Sex. Claudius Petronius Probus
| Roman consul
Valentinian Augustus IV
Valens Augustus IV
| Praetorian prefect of the East
| Urban prefect of Constantinople
| Comes Orientis