The temple of Apollo, which dates back to the 7th century BCE, was built by the Greek architects Trophonios and Agamedes. It has been rebuilt twice: first, in the 6th century BCE after it was destroyed by fire; second, in 330 BCE after being destroyed by an earthquake in 373 BCE. The theatre is built uphill from the temple of Apollo and dates to the 4th century BCE. It seats approximately 5,000 spectators. Both the theatre and the temple are located on the southwestern slopes of Mount Parnassus.