The founding of Rome involved one brother killing the other over a hill… and if you don’t think they had large scale civil war, you simply haven’t read Roman history
The founding of Rome involved one brother killing the other over a hill… and if you don’t think they had large scale civil war, you simply haven’t read Roman history
An interesting aside, the civil war being referenced was actually over a question of Roman citizenship, which used to only apply to people in the city. For quite some time, the (now-)Italian peninsula was under Roman control, but its inhabitants were given a sub-citizen status with much lesser rights. The civil war established that citizenship could be offered to a much wider area.
...Ahem.
(It is not a pleasant period of history to read about.)
Roman history, particularly pre-imperial, does show a lot of "why exactly will they not just die?", but some level of resilience in large Mediterranean powers of antiquity was pretty common. (Carthage took two wars and decades to lose the Punic Wars.)