When was the callecium built?

The Colosseum, also known as the Flavian Amphitheatre, was commissioned by Emperor Vespasian in AD 70-72 and completed by his son, Emperor Titus, in AD 80. Additional modifications were made during the reign of Emperor Domitian, around AD 81-96. It is one of the most iconic symbols of ancient Rome and remains a significant historical monument today.