the colosseum, also known as the flavian amphitheatre, is a large artefact or structure in the city of rome. the construction of the colosseum started around 70–72 ad and was finished in 80 ad. emperor vespasian started all the work, and emperor titus completed the colosseum. emperor domitian made some changes to the building between 81–96 ad. it had seating for 50,000 people. it is the biggest amphitheatre built by the roman empire. it was built between 81-96 ad.