Gwenhwyfach

Gwenhwyfach (or Gwenhwyvach, Gwenhwyach, Guinevak (anglicized), etc.) is a sister of Gwenhwyfar (Guinevere) in early Welsh Arthurian legend. The tradition surrounding her is preserved in fragmentary form in two Welsh Triads and the Mabinogi tale of Culhwch and Olwen.