UTHER

Set to 2 different clues across 5 published puzzles, most often “King Arthur's father” — The New York Times, Friday, 28 March 2003.

5 letters

Every clue on record, most used first

King Arthur's father3 times
The New York Times — Friday, 28 March 2003
___ Pendragon, King Arthur's father2 times
The New York Times — Friday, 9 November 2007