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Gallienus, born Publius Licinius Egnatius Gallienus in January 218, was a male figure of Ancient Rome who served as Roman emperor and Roman consul. He was the son of Valerian and Egnatia Mariniana and held citizenship in Ancient Rome. His professional roles included work as a politician, poet, and military personnel within the fields of politics and military affairs during the Low Roman Empire and the Principate. He spoke Latin and adhered to ancient Roman religion.

He was married to Cornelia Salonina and had an unmarried partner named Pipara. Gallienus had three children: Valerian II, Saloninus, and Marinianus. He died in Mediolanum in January 268 as a result of homicide. His native name is recorded as P.Licinius Egnatius Gallienus, and he is associated with the Licinia gens. He is described in sources such as The Nuttall Encyclopædia, Brockhaus and Efron Encyclopedic Dictionary, Encyclopædia Britannica 11th edition, and The Catholic Encyclopedia.