The situation with the Temple of Olympian Zeus is a little more complicated than your statement. Construction began during the time of king Peisistratos (ca. 560-527 BCE), as we we are told by Aristotle in his Politiics, most likely as a Doric building but didn't go much beyond preparing the foundations. In 174 BCE, king of Syria Antiochos Epiphanes ordered to continue work but didn't go very far. Some scholars think that that time the temple had been planned as Ionic. It was left up to the Roman Emperor Hadrian (117-138 CE), who loved architecture more than any other ruler in history and left behind the most extraordinary building legacy, to complete the temple this time as Corinthian, the most luxurious of Roman Temples. Hadrian was dedicated the temple in 130 CE during his second visit to his beloved Athens. Inside, Hadrian ordered a copy of one of the Seven Wonders of the ancient world the gold and ivory statue of Zeus in Olympia by Pheidias and placed a colossal one of himself next to it. All this had been looted when Cyriacus of Ancona visited Athens in 1450 and found only 21 columns still standing.