Caelius Hilarianus

Caelius Hilarianus was a Roman aristocrat of senatorial rank (vir clarissimus) active in the second half of the 4th century CE. He is known through inscriptions discovered in the Vatican Phrygianum, where he appears as a prominent participant in the complex religious milieu of late pagan Rome.

An inscription dated to 13 May 377 describes him as pater sacrorum and hieroceryx of Mithras, as well as priest of Liber and Hecate. Like several aristocratic pagans of the period, Caelius Hilarianus combined priesthoods from different mystery cults and traditional religious institutions, reflecting the syncretic and highly ceremonial character of the last pagan aristocratic circles of Rome.

His inscriptions belong to a broader group of late Roman dedications associated with senators such as Ulpius Egnatius Faventinus and Alfenius Ceionius Iulianus Kamenius, who cultivated Mithraic, Dionysiac, Hecatean, Isiac, and Magna Mater priesthoods simultaneously. Modern scholarship often sees these figures not as representatives of “classical” Mithraism in its earlier military and mercantile form, but as part of the late pagan aristocratic revival of the 4th century.

Caelius Hilarianus is therefore an important witness to the transformation of Mithraism in Late Antiquity, when the cult became increasingly integrated into the religious and social self-representation of the Roman senatorial elite.