[3] Esyllt is fearful at their approach, but Trystan comforts her and then escapes from the forest, walking unmolested through the lines of Arthur's men because he has the gift of invulnerability.
Esyllt responds, "There are three trees that are good of their kind, holly and ivy and yew, which keep their leaves as long as they live.
[5][6][7] The tale told in a combination of prose and verse is a very old Welsh literary form, examples of which can be found as early as the 9th century.
The Celticist Rachel Bromwich ultimately came to the conclusion that both of these, as well as the Ystorya Trystan, deal with episodes in the legend in which Trystan and Esyllt contrive to meet without the knowledge of Esyllt's husband, March, and that none of these three Welsh works is independent of the "Tryst beneath the tree" episode in French and other continental Tristan romances.
[13] It has also been suggested that the Ystorya has a distant connection with the episode in the French romance Tristan by Béroul in which Arthur is summoned to serve as a judge in Iseut's trial.