Instead of dying Julia gives pompey a son. Within a year both pompeys other sons are dead of natural causes. What happens when two of romes most powerful men have the same heir?
Instead of dying Julia gives pompey a son. Within a year both pompeys other sons are dead of natural causes. What happens when two of romes most powerful men have the same heir?
Considering how quickly they are falling out at this point, nothing much would change. The child is still a baby so he's not a proper heir in Roman eyes. By the time he becomes a man at 15, Caesar and Pompey have long since gone to war.
Didn't know the baby inheritance thing
While a son of Julia would not have an inherent claim, I think chances are that he would indeed be Caesar's designated heir by the time the civil war starts (if we do get something resembling the OTL Civil War), although he would not be Pompey's heir for the simple reason his elder brothers Gnaeus and Sextus come first.
Pompey was Caesar's heir all up until the Civil War, at which point his will was most likely modified in 48 to remove Pompey (presumably leaving Mark Antony as his heir, but there is no concrete evidence there), and in 45, removing Antony and putting Octavian as first heir and Decimus Brutus as second.
If Caesar has a grandson from Julia (who will not have enough age to play any sort of part in the Civil War), it's more than likely that he would be named adoptive heir on account of being a much closer relative than Octavian, Quintus Pedius and Lucius Pinarius as great-nephews and Decimus Brutus and Mark Antony as very distant cousins. If OTL has played out by this stage Gnaeus Pompey is dead and Sextus is a renegade, meaning this grandson of Caesar can inherit his name and also Pompey's fortune (or whatever remains of it following the civil war).