The defining moment of Geta's life happened eleven months before he was born. This was when his brother Lucius Bassianus (the future emperor Caracalla) was born to Geta's parents, Domna Julia and Septimius Severus.
During the period when both brothers were born, Septimius Severus was an imperial functionary in the court of the emperor Commodus, the last of Rome's Antonine dynasty. Due to the demands of the imperial service, Lucius Bassianus was born while his father was serving in Gaul, and on 7 March 189, Geta was born in Milan, Italy. (This birthplace is recorded in the 'Life of Geta' in the notoriously unreliable Historia Augusta, which proves its unreliability by saying in the 'Life of Septimius Severus' that Geta was born in Rome.)
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