The Colosseum (/ˌkɒləˈsiːəm/ KOL-ə-SEE-əm; Italian: Colosseo [kolosˈsɛːo]), is an oval amphitheatre in the centre of the city of Rome, Italy, just east of the Roman Forum and is the largest ancient amphitheatre ever built, and is still the largest standing amphitheater in the world today, despite its age. Construction began under the emperor Vespasian (r. 69–79 AD) in 72[1] and was completed in AD 80 under his successor and heir, Titus (r. 79–81).[2] Further modifications were made during the reign of Domitian (r. 81–96).

https://en.wikipedia.org/wiki/Colosseum