The largest Roman baths were built by Diocletian

Maximian, who shared control of the empire with Diocletian, was a co-emperor. Diocletian, however, always saw himself as superior. This mindset made him unconcerned about charging Roman a high tax.He invested tax payer funds on the Roman Empire's military and infrastructure. Diocletian increased the imperial tax in 297, which made it simpler for the emperor to obtain money for government spending. The money obtained was utilized to build the Diocletian Baths. For Diocletian at the time, it was one of his major undertakings.

Between 298 and 306 A.D., the Diocletian Baths were built. The largest Roman baths of its sort ever built existed today in ancient Rome. The structure, which covered 13 hectares (32 acres), could house 3,000 people at once. The old entertainment complex's façade later underwent renovation. An integrated version of this historic building is the Santa Maria Degli Angeli e dei Martiri church, built in the sixteenth century. This 16th-century church was created by Michelangelo.