Tristan and Iseult is a tale made popular during the 12th century through French medieval poetry .The tragic story is of the adulterous love between the Cornish knight Tristan (Tristram) and the Irish princess Iseult (Isolde, Yseult, etc.).
The narrative predates and most likely influenced the Arthurian romance of Lancelot and Guinevere, and has had a substantial impact on Western art, the idea of romantic love and literature since it first appeared in the 12th century.