Final answer:
The Flavian Amphitheater, also known as the Colosseum, was completed in the year 80 CE. It started under Emperor Vespasian in 70 CE and was inaugurated with a hundred days of games by his successor, Titus.
Step-by-step explanation:
The completion year of the Flavian Amphitheater in Rome, Italy, commonly known as the Colosseum, is 80 CE. Construction of this iconic structure began under the rule of Emperor Vespasian in 70 CE and was completed by his successor, Titus, in 80 CE. It was conceived both as a venue for public entertainment and as a monumental tribute to the Flavian dynasty's military triumphs, particularly those during the Jewish wars.
The amphitheater was innovative in its use of structural concrete, featured an advanced design with a complex network of barrel vaults, and could hold between 50,000 to 80,000 spectators. Official dedication ceremonies, which included a hundred days of games, were conducted to mark its opening.