 Julia Maesa took advantage of this, to suggest to the soldiers that Elagabalus was indeed the illegitimate son of Caracalla.On May 16, Elagabalus was proclaimed emperor by the Legio III "Gallica" at its camp at Raphanea.Upon Elagabalus' revolt, Macrinus travelled to Apamea and conferred the title of Augustus onto his son, Diadumenianus, and made him co-emperor.