<P> In the Prose Tristan and works derived from it, Tristan is mortally wounded by Mark, who treacherously strikes Tristan with a poisoned lance while the latter is playing a harp for Iseult . The poetic versions of the Tristan legend offer a very different account of the hero's death . According to Thomas' version, Tristan was wounded by a poison lance while attempting to rescue a young woman from six knights . Tristan sends his friend Kahedin to find Iseult, the only person who can heal him . Tristan tells Kahedin to sail back with white sails if he is bringing Iseult, and black sails if he is not . Iseult agrees to return to Tristan with Kahedin, but Tristan's jealous wife, Iseult of the White Hands, lies to Tristan about the colour of the sails . Tristan dies of grief, thinking that Iseult has betrayed him, and Iseult dies swooning over his corpse . Several versions of the Prose Tristan include the traditional account of Tristan's death found in the poetic versions . </P> <P> In French sources, such as those carefully picked over and then given in English by the well - sourced and best - selling Belloc translation of 1903, it is stated that a thick bramble briar grows out of Tristan's grave, growing so much that it forms a bower and roots itself into Iseult's grave . It goes on that King Mark tries to have the branches cut three separate times, and each time the branches grow back and intertwine . This behaviour of briars would have been very familiar to medieval people who worked on the land . Later tellings sweeten this aspect of the story, by having Tristan's grave grow a briar, but Iseult's grave grow a rose tree, which then intertwine with each other . Further tellings refine this aspect even more, with the two plants being said to have been hazel and honeysuckle . </P> <P> A few later stories even record that the lovers had a number of children . In some stories they produced a son and a daughter they named after themselves; these children survived their parents and had adventures of their own . In the romance Ysaie the Sad, the eponymous hero is the son of Tristan and Iseult; he becomes involved with the fairy - king Oberon and marries a girl named Martha, who bears him a son named Mark . </P> <P> Known as The Tristan Stone, or The Longstone (Cornish: Menhir, meaning long stone), is a 2.7 m tall granite pillar near Fowey in Cornwall . The stone has a mid-6th century two line inscription which has been interpreted as reading DRVSTANVS HIC IACIT CVNOMORI FILIVS "Drustan lies here, the son of Cunomorus". A now missing third line was described by the 16th century antiquarian John Leland as reading CVM DOMINA OUSILLA "with the lady Ousilla". Ousilla is a Latinisation of the Cornish female name Eselt, otherwise known as Isolde . The disappearance of this third line may be as a result of the stone being moved several times over the past three centuries . </P>

Who is poisoned in the episode of the fair maiden of astolat