Caracalla recalled Marcellus from Roman Britain to Rome and briefly placed him in the roles of Praefectus urbi and Praetorian prefect.
[2] Through marriage, Marcellus was related both to the Severan dynasty of the Roman Empire and the royal family of Emesa, Syria.
[7] Marcellus and Soaemias' marriage may have been arranged to strengthen Lucius Septimius Severus' position in the Roman East.
After his death in c. 215, his wife Julia Soaemias Bassiana and their two sons, dedicated to him a tombstone which was found in Velletri, not far from Rome.
[11] The bilingual inscription which is in Greek and Latin on an altar, dedicated by him is honoring Bel in remembrance of the oracles given to him in Apamea.
[11] The Baths of Varius (Thermae Varianae) in Rome were named in honor of Marcellus and his second son by the Legio XIII Gemina.