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|Appearance:||Yellow with white stripes|
Gladius was one of the unharnessed dragons recruited for Temeraire's regiment from the Pen Y Fan Breeding Grounds during Napoleon's invasion of Britain in December 1807. Along with Chalcedony, Gladius was chosen by the unharnessed Yellow Reapers as one of the best and most enthusiastic fighters to accompany Temeraire for what proved to be guerrilla warfare, while Cantarella was put in charge of the Reapers who stayed behind with the main force and given an epaulette to mark her rank.
Gladius means "sword" in Latin.