He is known exclusively through his Middle High German romance Tristrant, the oldest surviving complete version of the Tristan and Iseult story in any language.
[5]) Tristrant also preserves scenes that do not survive in the known French fragments, most notably the conclusion; it contains the earliest known telling of Tristan's banishment and marriage to the second Iseult (the daughter of Hoel of Brittany), and of the lovers' deaths in a tragic turn of events.
Because of its relatively early date of composition, its relationship to Béroul's common branch, and its relatively intact state, Eilhart's Tristrant is of interest to scholars documenting the development of the Tristan and Iseult legend.
French academic Joseph Bédier used it as the template for his Romance of Tristan and Iseult, his attempt to reconstruct what the story may have been like in its earliest state (the so-called "Ur-Tristan.
For example, Lacy, Ashe and Mancroff's The Arthurian Handbook says the poem is "overshadowed" by Gottfried's masterful version and provides its characters with weak psychological motivations, though it is still "worthy of admiration.