Put time in order

These are mixed up. Number them 1 to 6. The founding year is a story date. We are not sure it is exact.

1. ____Hadrian builds a wall in Britain
2. ____Kingdom stories, maybe 753 BC
3. ____The Colosseum opens
4. ____The western emperors fade, AD 476
5. ____Augustus becomes the first emperor
6. ____The Republic and the wars with Carthage