Ambrose, bishop of Milan, described Rumoridus in a letter to Eugenius as maintaining the practice of ethnic religions from earliest childhood.
[3] He began his service as a career military officer, and may have been posted at some point in the Diocese of Thrace.
[4] He was eventually appointed a magister militum under Valentinian II in AD 384, was present during the debate regarding the restoration of the Altar of Victory in the Curia Julia.
[6] Although he was probably an old man, in AD 403 Rumoridus was made consul in the West at the same time as the infant Theodosius II in the East.
It has been suggested by Martindale and Jones that he was recalled to military service as a result of the crisis precipitated by the invasion of Italy by Alaric and the Visigoths in AD 402, and may have played a part in Alaric's defeat and retreat from Italy in AD 403.