When Sir Kay brings Sir Ector the magical sword * Sir Kay tells his father that he pulled it from the stone Arthur complains that Sir Kay took the sword from him Arthur denies knowing anything about the sword Sir Ector demands that Sir Kay replace the sword

Sir Hector, Antor, or even Ectorius in some legends, is the father of Sir Kay and the adoptive father of King Arthur in the Arthurian legend. Probably the eldest knight of the round Table, Sir kat  brings Sir Ector the sword and claims that he is the rightful King

Explanation:

Sir Ector confronts Him with a challenge of honor;

"But Sir Ector insisted that they should all ride to the churchyard, and once there, bound Sir Kay by oath to tell how he had come by the sword."