The Roman emperor who constructed the surviving Pantheon in Rome was Hadrian.
The building replaced an earlier Pantheon commissioned by Marcus Agrippa during Augustus’s reign. Hadrian’s structure was probably completed around 125 CE, although its exact construction date is uncertain. The inscription on the façade still names Agrippa, reflecting Roman respect for the earlier monument and its patron.
The Pantheon’s famous concrete dome has a central opening called the oculus. Its design combines a columned entrance with a vast circular interior, making it one of the best-preserved major Roman buildings. The present structure is therefore associated with Hadrian, not solely with Agrippa, whose earlier building had burned.