This temple has acquired its name solely because
of its circular shape; infact, there was only one temple dedicated
to Vesta, the one in the Roman Forum. That one, was dedicated to
Hercules. With its columns, its Corinthian capitals, it’s
an elegant building which dates from the reign of Augustus. During
the Middle Ages, a church was established in the cella; in 16C it
was dedicated to S. Mary of the Sun.