"Gwenhwyfar and her maidens"
Lancelot and Guinevere
Public DomainLancelot and Guinevere - Credit: Herbert James Draper

Gwenhwyfar was the wife of King Arthur who (according to the Arthurian romances) was unfaithful to her husband with the knight Sir Lancelot. The name Gwenhwyfar translates as ‘fair phantom’, which corresponds to Findabair, who appears in the Irish story Táin Bó Cúailnge (‘The Cattle Raid of Cooley').  In French Arthurian tales, she is known as Guenièvre, and in English versions, as Guinevere. The name Jennifer is said to derive from Gwynnever, the Cornish version of the name.