The 'Portico of the United gods' at the western end of the forum was a building the upper floor of which consisted of eight rooms, six of which were occupied with statues of seated deities. The floor below was taken up by shops.
An intial portico occupied the spot since the first century AD. The current remains are from a later reconstruction in AD 367. The portico was discovered in excavation of the 19th century and the discovered columns were re-erected.