In the Arthurian Legend of Tristan and Iseult (alternatively Isolde, Isode, Isotta, etc.), there are actually two Iseults involved with him. The first was called Iseult of Ireland, daughter of King Anguish of Ireland. She loved Tristan deeply but was promised to King Mark of Cornwall. The second Iseult was the one Tristan ended up marrying, called Iseult of the White Hands. Tristan did not love this Iseult, but rather Iseult of Ireland. When Tristan was mortally wounded, he called for Iseult of Ireland in the hopes that she might be able to heal him. When her ship arrived, Tristan asked what color the sails were (white meaning she would come, black meaning she wouldn't). The sails were white, yet Iseult of the White Hands, resentful of his love for the other Iseult, lied and Tristan therefore died.

Iseult was also the name given to Tristan's grand-daughter.

See also: List of Arthurian Characters