From the Wiki article on Geta:
"In 205 Geta and Caracalla were consuls together although they did not get along. When their father died, Caracalla tried to rule alone with his brother Geta playing the role of emperor in name only, but Geta or their mother Julia Domna wouldn't go along with this. Geta and Caracalla tried to divide the empire, but Julia Domna stood opposed."
The division was going to be through the Bosphorus, with Caracalla ruling the western half from Rome and Geta ruling the eastern half from Antioch or Alexandria.
What would have happened had Caracalla overruled his mother and the split taken place?
"In 205 Geta and Caracalla were consuls together although they did not get along. When their father died, Caracalla tried to rule alone with his brother Geta playing the role of emperor in name only, but Geta or their mother Julia Domna wouldn't go along with this. Geta and Caracalla tried to divide the empire, but Julia Domna stood opposed."
The division was going to be through the Bosphorus, with Caracalla ruling the western half from Rome and Geta ruling the eastern half from Antioch or Alexandria.
What would have happened had Caracalla overruled his mother and the split taken place?