Although he was an eastern provincial, he was assigned the dual role of praetorian prefect of Italy (which the emperor Constans gave to him when he created the new Prefecture, splitting Italy off from the Praetorian prefecture of Illyricum)[2] as well as praefectus urbi of Rome.
This unusual appointment not only reflected Constans' upbringing in Constantinople, but was also probably indicative of a long-standing relationship with a trusted subordinate.
[3] In AD 348, Limenius, as Urban Prefect, probably celebrated the Secular Games in the emperor's name, as Constans was absent from Rome.
One, dated 28 March 349, was aimed at the preservation of columns and monuments, as well as preventing the violation of tombs in the city of Rome.
[6] In AD 349, Limenius was appointed consul prior alongside Aconius Catullinus Philomatius.