King Arthur Pendragon was a legendary British leader of Camelot. Legends place his reign during the late 5th and early 6th centuries. The historical basis for the King Arthur legend has long been debated by scholars. For a fleeting moment in 2260, Babylon 5 senior staff speculated that the Vorlons had abducted Arthur and had returned him in their hour of need.
In 2260, David McIntyre traveled to Babylon 5, under the delusion that he was Arthur, dressed in armor and carrying a sword. David claimed the last thing he remembered was lying on the field of battle at Camlan. Sir Bedivere, had pulled him away from these peasants who were looting the bodies of my fallen knights. Dying, he asked three times for Bedivere to return Excalibur to the Lady of the Lake. McIntyre's delusion combined his real-world experience with starting the Earth-Minbari War and the final battle before Arthur's death.