The Basilica Julia was built on the site of the earlier Basilica Sempronia (170 BC) along the south side of the Forum, opposite the Basilica Aemilia. It was initially dedicated in 46 BC by Julius Caesar, with building costs paid from the spoils of the Gallic War, and was completed by Augustus, who named the building after his adoptive father. The ruins which have been excavated date to a reconstruction of the Basilica by the Emperor Diocletian, after a fire in 283 AD destroyed the earlier structure.