Lucius Septimius Bassianus, later known as Caracalla, was born on the 4 April, 188 A.D to Lucius Septimius Severus and Julia Domna. As part of his father's attempt to establish his family as a dynasty in the fashion of the Antonines, he was renamed Marcus Aurelius Antoninus, linking his two predecessors and the last to reign during the Pax Romana, a period of stability, wealth, and peace from 27 B.C. to 180 A.D., Antoninus Pius and Marcus Aurelius. Later, in 198 A.D. he was made co-ruler reigning with his father until 209 A.D. when his brother Publius Septimius Geta, known as Geta, would also come to reign alongside their father until Septimius Severus' death in 211 A.D. Within the year Caracalla had his Praetorian Guard murder his brother to take full control and reign as Rome's sole emperor.
It was around this time that Caracalla started to produce the "One Ruler" type portrait to help legitimize his claim throughout the empire. This type is best characterized by the "Caracalla Farnese" in the Naples National Archaeological Museum.