The legend of Tristan and Isolde is an influential romance and tragedy, retold in numerous sources with as many variations. The tragic story of the adulterous love between the Cornish knight Tristan (Tristram) and the Irish princess Isolde (Iseult, Yseut, etc.), the narrative predates and most likely influenced the Arthurian romance of Lancelot and Guinevere, and has had a substantial impact on Western art and literature since it first appeared in the 12th century. While the details of the story differ from one author to another, the overall plot structure remains much the same.
(Fuente: mrsbeefheart, vía karrova)