King Arthur

King Arthur was the king of Camelot.

Biography
He first meets the Doctor along with Mia and James, whilst married to Guinevere and learns of the Cybermen. (TV: Robots of the Round Table) Together with his knights and the Doctor, Mia and James, King Arthur battled the forces of Mordred and Morgaine, but was killed at the Battle of Camlann. The Doctor, realising he is actually Merlin, placed Arthur's body and Excalibur in a dimension-crossing spaceship and hid it at the bottom of Lake Vortigern, near Carbury, in rural England. (TV: The Battle of Camlann)

In the late 20th century, the Seventh Doctor and Ace discovered Arthur's spaceship and retrieved Excalibur. They later discovered that stories of Arthur's survival were just propaganda and that the King really was dead after all. (TV: Battlefield)