The article does not name the original architect or confirm the client. Scholars link it to the emperors Valentinian, Theodosius I or Stilicho, or call it an imperial mausoleum. It was built in the late 4th to early 5th centuries, perhaps from 390 to 402, and the infobox gives 364 and 402. The plan was a square central hall with four apses and a dome, described as the largest central-plan building in the West at the time. Some materials reportedly came from a nearby amphitheater.
The dome collapsed in 1573, and Martino Bassi designed its replacement, finished in 1619. Cesare Nava built the front vestibule in 1894 in stone-like cement. The 1944 and 1945 bombings destroyed nearby houses, and a park replaced them.
It is a Catholic basilica of the Archdiocese of Milan. The article states no heritage status.

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