The hall was built between AD 300 and 310, during the reigns of Constantius Chlorus and Constantine the Great, and the infobox gives 310. The article names Constantine but does not say he commissioned it. It calls the hall the largest extant one from classical antiquity. It is 220 feet (67 m) long, 85 feet (26 m) wide and 108 feet (33 m) high, a basilica with no interior columns.
It is solid brick, with black-and-white marble floors and a hypocaust that heated the floor and walls. It was part of a palace complex. In the Middle Ages it became the Bishop of Trier's residence, and in the 17th century Archbishop Lothar von Metternich built a palace around it.
Frederick William IV of Prussia ordered a restoration to its Roman state, supervised by Carl Schnitzler, and in 1856 it became a Protestant church. It burned after an air raid in 1944. UNESCO listed it in 1986.
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