Tristan and Iseult in the context of "Love potion"

Tristan und Isolde (Tristan and Isolde), WWV 90, is a music drama in three acts by Richard Wagner set to a German libretto by the composer, loosely based on the medieval 12th-century romance Tristan and Iseult by Gottfried von Strassburg. First conceived in 1854, the music was composed between 1857 and 1859 and premiered at the Königliches Hoftheater und Nationaltheater in Munich on 10 June 1865 with Hans von Bülow conducting. While performed by opera companies, Wagner preferred the term Handlung (German for "plot" or "action") for Tristan to distinguish its structure of continuous narrative flow ("endless melody") as distinct from that of conventional opera at the time which was constructed of mundane recitatives punctuated by showpiece arias, which Wagner had come to regard with great disdain.

Wagner's composition of Tristan und Isolde was inspired in part by the philosophy of Arthur Schopenhauer, as well as by his relationship with his muse Mathilde Wesendonck. The opera, which explores existential themes such as that of mankind's insatiable striving and the transcendental nature of a love beyond death, incorporates spirituality from Christian mysticism as well as Vedantic and Buddhist metaphysics, subjects that also interested Schopenhauer. As such, Wagner was one of the earliest Western artists to introduce concepts from the Dharmic religions into their works.

Le Morte d'Arthur (originally written as le morte Darthur; Anglo-Norman French for "The Death of Arthur") is a 15th-century Middle English prose compilation and reworking by Sir Thomas Malory of tales about the legendary King Arthur, Guinevere, Lancelot, Merlin and the Knights of the Round Table, along with their respective folklore, including the quest for the Holy Grail and the legend of Tristan and Iseult. In order to tell a "complete" story of Arthur from his conception to his death, Malory put together, rearranged, interpreted and modified material from various French and English sources. Today, this is one of the best-known works of Arthurian literature. Many authors since the 19th-century revival of the Arthurian legend have used Malory as their principal source.

Apparently written in prison at the end of the medieval English era, Le Morte d'Arthur was completed by Malory around 1470 and was first published in a printed edition in 1485 by William Caxton. Until the discovery of the Winchester Manuscript in 1934, the 1485 edition was considered the earliest known text of Le Morte d'Arthur and that closest to Malory's original version. Modern editions under myriad titles are variable, changing spelling, grammar and pronouns for the convenience of readers of modern English, as well as often abridging or revising the material.

Tristan (Latin/Brythonic: Drustanus; Welsh: Trystan; Italian: Tristano, Portuguese: Tristão; Spanish: Tristán), also known as Tristran or Tristram and similar names, is the folk hero of the legend of Tristan and Iseult. While escorting the Irish princess Iseult to wed Tristan's uncle, King Mark of Cornwall, Tristan and Iseult accidentally drink a love potion during the journey and fall in love, beginning an adulterous relationship that eventually leads to Tristan's banishment and death.

The character's first recorded appearance is in the 12th-century poetic tellings initiated by Béroul and Thomas of Britain, which were eventually vastly expanded in the later tradition from the vast Prose Tristan. In later versions of his story he is featured in Arthurian legend, including the seminal compilation Le Morte d'Arthur, as a great Knight of the Round Table and friend of Lancelot.

Gottfried von Strassburg (died c. 1210) is the author of the Middle High German courtly romance Tristan, an adaptation of the 12th-century Tristan and Iseult legend. Gottfried's work is regarded, alongside the Nibelungenlied and Wolfram von Eschenbach's Parzival, as one of the great narrative masterpieces of the German Middle Ages. He is probably also the composer of a small number of surviving lyrics. His work became a source of inspiration for Richard Wagner's opera Tristan und Isolde (1865).