 This confusion extended to other opponents of the Olympians, including the huge monster Typhon, the offspring of Gaia and Tartarus, whom Zeus finally defeated with his thunderbolt, and the Aloadae, the large, strong and aggressive brothers Otus and Ephialtes, who piled Pelion on top of Ossa in order to scale the heavens and attack the Olympians (though in the case of Ephialtes there was probably a Giant with the same name).For example, Hyginus includes the names of three Titans, Coeus, Iapetus, and Astraeus, along with Typhon and the Aloadae, in his list of Giants, and Ovid seems to conflate the Gigantomachy with the later siege of Olympus by the Aloadae.Ovid also seems to confuse the Hundred-Handers with the Giants, whom he gives a "hundred arms".