I'm assuming you are referring to Thibaut IV, Count of Champagne & King of Navarre. One of the most fascinating and talented of the trouveres. Descended from Eleanor of Acquitaine. The poem Robert, veez de Pieron, if that is what you seek, is considered a retroncha because of the the refrain and rhyme scheme. Do look at Ausi com l'unicorne as well.
Of the three editions listed below, I would start with Tischler, though Angles and Werf are perhaps worth perusing as they are good. You can also look at K. Brahney : The Lyrics of Thibaut de Champagne (New York, 1989) I have not this book but I would assume it is in there. dt Editions: (From Grove) Las canciones del Rey Teobaldo, ed. H. Angl=E8s (Pamplona, 1973)Trouv=E8res-Melodien, ii, ed. H. van der Werf, MMMA, xii (1979)Trouv=E8re Lyrics with Melodies: Complete Comparative Edition, ed. H. Tischler, CMM, cvii (1997) -- To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
