A timeline. 27 B C E to 180 C E PAX ROMANA. 44 B C E The Roman Empire was founded. 80 C E The Colosseum was built. 121 C E Hadri
an's Wall was built in England to keep out enemies. 306 C E Constantine became emperor. How many years passed between the building of the Colosseum and the building of Hadrian’s Wall?
