Ovid, in his "Metamorphoses", describes mankind's moral decline through the ages of gold, silver, bronze and iron, and presents the Gigantomachy as a part of that same descent from natural order into chaos. Lucan, in his "Pharsalia", which contains many Gigantomachy references, makes the Gorgon's gaze turn the Giants into mountains. Valerius Flaccus, in his "Argonautica", makes frequent use of Gigantomachy imagery, with the Argo (the world's first ship) constituting a Gigantomachy-like offense against natural law, and example of hubristic excess.