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Poseidon or Neptune
Lord of the Sea; god of the seas, earthquakes and horses. Symbols include the hippocamp and the trident. Son of Cronus and Rhea. Brother of Zeus and Hades.
|First commissioned byduring the reign of , the was a temple dedicated to all the gods of ancient . rebuilt it in 126 A.D. The building is circular with a of large granite Corinthian columns (eight in the first rank and two groups of four behind) under a . A rectangular vestibule links the porch to the rotunda, which is under a coffered concrete dome, with a central opening (oculus) to the sky. Almost two thousand years after it was built, the Pantheon's dome is the world's largest unreinforced concrete dome. The height to the oculus and the of the interior are the same, 43.3 meters (142 ft. It is one of the best-preserved of all Roman buildings. It has been in continuous use throughout its history, and since the 7th century, the has been used as a Roman Catholic dedicated to "St. Mary and the Martyrs" but informally known as "Santa Rotonda." The square in front of the is called Piazza della Rotonda.|