Didyma Temple of Apollo The Persians destroyed the original 6th century BCE temple at the beginning of the 5th century BCE. The extant temple ruins belong to the unfinished second temple, whose construction began at the end of the 4th century BCE, under Alexander the Great’s patronage. The same architect was responsible for the temple of Artemis in Ephesus. A double line of 108 Ionic columns surrounded the temple. Heads of bulls, Zeus, Apollo, Artemis, and Leto decorated columns at the corner.