Claim: Agravain was a knight of the round table married to Laurel and first mentioned in Perceval, the Story of the Grail.
Evidence: Sir Agravain (/æɡræveɪn/) is a Knight of the Round Table in Arthurian legend, whose first known appearance is in the works of Chrétien de Troyes. In Thomas Malory's Le Morte d'Arthur, Arthur marries him with Laurel, a niece of Lynette and Lyonesse. Perceval, the Story of the Grail by Chrétien de Troyes 
Knight of the Round Table Florée or Laurel Perceval, the Story of the Grail by Chrétien de Troyes