Answer:
1. Julius ceaser died first
2. The Byantine Empire.
3. He lived during the Roman Republic.
4. Its because of political revolution, causing the new republic.
5. they lost many military because they weren't as focused on the outsiders trying to invade than the political conflicts going on within Rome. Which made people from the outside of Rome able to destroy it.
6. about 10 years I think.
7. No, because there was no such thing as Christianity during his time. They still believed in the multiple gods. I know this because Christianity was never a think in BC.