Below you can find the In arthurian legend king arthur slays this treacherous relative in battle Jeopardy Words Answer. The answer to In arthurian legend king arthur slays this treacherous relative in battle has 7 letters. This clue belongs to the Mortal matters category and is part of Jeopardy Word Level 2350. If you scroll near the bottom you will find other clues and answers part of level 2350