"The construction had a much larger part to play in the Flavian political governance of Rome than just a place for entertainment. In Vespasian’s mind, it would help consolidate the Flavian dynasty. He began construction of the Flavian Amphitheatre as part of a widespread propaganda campaign."

"... The most notable construction of course being the completion of the Colosseum. It instantly became a triumphal monument that promoted the Flavian reign by commemorating the family’s military achievements during the Jewish War."

"The Flavian success in the Jewish War was important as many historians believe that Titus brought over Jewish prisoners of war to contribute to the workforce needed for the construction of the amphitheatre. This very much kept with the Roman practice of humiliating their defeated enemies further, and as a way of demonstrating their power. In addition, the placement of the amphitheatre is often assumed a deliberate move by Vespasian who built the Colosseum on the land which previously held Nero, his predecessor’s, palace."

A lot of fantastic historical feats of engineering were built from the blood of the conquered. Even the street of the city where I am is built by captured prisoners of war that were put to work as slaves.