its visitors, the temple boasted columns tall and in diameter, visually sitting atop a marble stairway that connected the base of the hill to the sanctuary. An enormous fragment of entablature, weighing approximately 100 tons and in volume (the largest in Rome), belongs to the original temple, as do the statues of the Nile and the Tiber, moved by Michelangelo to the Capitoline Hill in front of the Senate building. Hadrian's Villa Emperor Hadrian (117–138) ordered the construction of a "canopus" in his villa in Tivoli with typical imperial grandeur: an immense rectangular tank representing a canal, long by wide was surrounded by porticoes and statues, leading the way to a Serapeum. Protected by a monumental dome, the sanctuary was composed of a public area and a more intimate subterranean part that was dedicated to the chthonic aspect of Serapis. To mark the inauguration of his temple, Hadrian struck coinage that carry his effigy accompanied by Serapis, upon a dais where two columns support a round canopy. In this manner, the emperor became synnaos, a companion of the god's arcane naos and equal beneficiary of the cult of Serapis at Canopus. In February 2021, archaeologists led by researcher Rafael Hidalgo Prieto from the Pablo de Olavide University announced the discovery of remains of Hadrian's breakfast room which used to show his imperial power. They revealed a structure as a water triclinium and a separate dining room that served as a model for the well-known Serapeum in his villa. Ostia Antica The Serapeum of Ostia Antica was inaugurated in 127 CE and dedicated to the syncretic cult of Jupiter Serapis. It is a typical Roman sanctuary, on a raised platform and with a row of columns at the entrance, where a mosaic representing Apis in a typically Egyptian manner can still be seen. From this temple likely came the statue that Bryaxis copied for the Serapeum in Alexandria. Pozzuoli The Macellum of Pozzuoli, marketplace or macellum of the Roman city of Puteoli (now known as Pozzuoli) was first excavated in the 18th century, when the discovery of a statue of Serapis led to the building being misidentified as the city's serapeum, the Temple of Serapis. Under that name, the site had considerable influence on early geology as a band of boreholes affecting the three standing columns suggested that the building had been partly below sea level for some period. Serapea in