Talk:Tristan/@comment-37376881-20181112222328/@comment-37738436-20181206231825

You asked some time ago so maybe you've already got an answer to your quesston, but if not, here's the thing:

Tristan & Isolde is an old legend that originally existed as its own romance that had nothing in common with the Arthurian legends; Tristan there serves under King Mark and the entire love triangle story ends with the lovers' death.

But contemporary Arthurian writers loooved to incorporate their favourite legendary figures into the nights of the Round Table so when the legends of King Arthur gained popularity during the 13th century, this one poet re-wrote Prose Tristan. It mostly follows the plot of the original legend, except Tristan escapes his death and flees to Logres, where The befriends many of the Knights of the Round Table, and eventually joins them.

I think this version also ends u with King Mark eventually causing Tristan's death, but first he gets to spend some time at King Arthur's court, participating in the grail quest and all.