What is the original name of the Colosseum in Rome?

The Colosseum's traditional original name was the Flavian Amphitheatre. In Latin, it was called the Amphitheatrum Flavium, linking the monument to the Flavian dynasty of emperors who sponsored its construction.

Work began under Emperor Vespasian around AD 70–72 and the building was dedicated by his son Titus in AD 80. Titus's brother Domitian later made substantial additions. Because all three emperors belonged to the Flavian family, historians use “Flavian Amphitheatre” to distinguish it from other Roman amphitheatres.

The name “Colosseum” became associated with the building later and is generally connected to the colossal statue of Nero that once stood nearby. Technically, the phrase “original name” has a small historical complication: surviving evidence does not prove that ancient Romans universally used “Flavian Amphitheatre” as the everyday name. Nevertheless, it is the standard and fairest answer in general-knowledge quizzes.