"the sunny temple of Venus"

The historical Hadrian dedicated more than one temple to Venus. The largest of these is the Temple of Venus and Roma, in the ceremonial heart of Rome, but the description here makes it clear that the reference is to the temple that he built on his private estate at Tivoli, a copy of the Sanctuary of Aphrodite at Knidos, which included a copy of Praxiteles's famous statue of the goddess.

The Temple of Venus at Tivoli
GNU Free Documentation LicenseThe Temple of Venus at Tivoli - Credit: Lalupa