query: When was the Pantheon in Rome constructed?
passage: Pantheon, Rome
The Pantheon (UK: /ˈpænθiən/, US: /-ɒn/;[1] Latin: Pantheum,[nb 1] from Greek Πάνθειον Pantheion, "[temple] of all the gods") is a former Roman temple, now a church, in Rome, Italy, on the site of an earlier temple commissioned by Marcus Agrippa during the reign of Augustus (27 BC – 14 AD). It was completed by the emperor Hadrian and probably dedicated about 126AD. Its date of construction is uncertain, because Hadrian chose not to inscribe the new temple but rather to retain the inscription of Agrippa's older temple, which had burned down.[2]
passage: Pantheon, Rome
Cassius Dio, a Graeco-Roman senator, consul and author of a comprehensive History of Rome, writing approximately 75 years after the Pantheon's reconstruction, mistakenly attributed the domed building to Agrippa rather than Hadrian. Dio appears to be the only near-contemporaneous writer to mention the Pantheon. Even by the year 200, there was uncertainty about the origin of the building and its purpose: