Essyllt Vinwen (Fyngwen)

   Essyllt Vinwen or Fyngwen, the daughter of Culvanawyd Prydain, and sister of Owain's faithless wife Penarwen, is mentioned very disparagingly in the Triads. She was married to March ab Meirchion, and acquired a very undesirable celebrity for her attachment to her husband's nephew Tristan ab Tallwch, the renowned Sir Tristan of the Romances, who bestow upon Essyllt the appellation of Yseult La Belle.