Marcus Julius Gessius BassianusPrado, The Emperor Elagabalus: Fact or Fiction?, p. xxiii (flourished 3rd century) was a Magister (master) in the Arval Brethren during the reign of Roman emperor Caracalla who ruled from 212 until 217.
Bassianus seems to be linked to the Julii and the Bassiani.Prado, The Emperor Elagabalus: Fact or Fiction?, p. 216 From his name, could point to him as a possible son of the Syrian Roman nobles Gessius Marcianus and Julia Avita Mamaea,Birley, Septimius Severus: The African Emperor, pp. 217, 222 being a possible brother of Roman emperor Alexander SeverusBirley, Septimius Severus: The African Emperor, p. 222 and his sister, Theoclia.Augustan History, "The Two Maximini", 29 If this is correct, Bassianus was a relation to the Royal family of Emesa and the Severan dynasty of the Roman Empire.Birley, Septimius Severus: The African Emperor He may then have been born about 190, first son of his very freshly married parents.
Bassianus was not a known Priest of the cult of Elagabalus.Prado, The Emperor Elagabalus: Fact or Fiction?, p. 215 Although he was a Roman Priest, was unable to attend the ceremonies of the Arval Brethren in Rome, probably due to Bassianus being based in the East.
References
Sources Augustan History, "The Two Maximini" A.R. Birley, Septimius Severus: The African Emperor, Routledge, 2002 L. de Arrizabalaga y Prado, The Emperor Elagabalus: Fact or Fiction?, Cambridge University Press, 2010