The most famous works of the Classical period for contemporaries were the colossal Statue of Zeus at Olympia and the Statue of Athena Parthenos in the Parthenon. Both were chryselephantine and executed by Phidias or under his direction, and are now lost, although smaller copies (in other materials) and good descriptions of both still exist. Their size and magnificence prompted emperors to seize them in the Byzantine period, and both were removed to Constantinople, where they were later destroyed in fires.[58]