The Orleans Knights are the knights who serve and protect the King and his capital, Anatae.
The Orleans Knights are warriors of the King who serve to protect the royal castle, the royal family and the capital city. They wear bright armor and wield spears and swords and carry shields. They also carry flags with them during expeditions, to symbolize their loyalty to the King of Anatae.
During the events involving Amira and Bahamut's reawakening, Kaisar Lidfard was knighted by Charioce XIII and later promoted to the position of Captain of the Orleans Knights, replacing Jeanne in captaincy as she had recently been stripped of the position by Charioce XIII, who had feared an overthrow from her.
When Charioce XVII ascended the throne, the Orleans Knights were replaced in terms of importance by the Onyx Task Force, though they remained loyal to the King and served him dutifully. Because of Charioce XVII's personal distaste for the gods, Jeanne d'Arc was banished from the Orleans Knights and the royal castle.
A couple of years later, Kaisar himself was stripped of his captaincy and imprisoned for offending Charioce XVII. Alessand Visponti, who despised the lack of importance of the Orleans Knights, sought to claim a position among the Onyx Task Force and murdered the Task Force's greatest threat, El, in order to prove himself. Alessand was offered a position, but he backed out once he realized the cost of joining the Onyx Knights. The Onyx Task Force Captain offered him instead the position of Captain of the Orleans Knights, which Alessand accepted.
Alessand, for the murder of El, was hunted down by Dias Bardolomew. Alessand was eventually killed by a terrified demon child while Kaisar, still a knight, died while sacrificing his life for Charioce XVII. The position of Captain of the Orleans Knights was thus handed over to Dias soon after the conflict with Bahamut. By this point, the Onyx Task Force have outlived their purpose.