Question: which king did the knights of the round table serve?
Answer: The Knights of the Round Table (Welsh: Marchogion y Ford Gron, Cornish: Marghekyon an Moos Krenn, Breton: Marc'hegien an Daol Grenn) are the knightly members of the legendary fellowship of King Arthur in the literary cycle of the Matter of Britain, appearing in literature since the mid 12th century.