The earliest representation of what scholars name the "courtly" branch of the Tristan legend is in the work of Thomas of Britain, dating from 1173. Only ten fragments of his "Tristan" poem, representing six manuscripts, have ever been located: the manuscripts in Turin and Strassburg are now lost, leaving two in Oxford, one in Cambridge and one in Carlisle. In his text, Thomas names another "trouvère" who also sang of Tristan, though no manuscripts of this earlier version have been discovered. There is also a passage telling how Iseult wrote a short lai out of grief that sheds light on the development of an unrelated legend concerning the death of a prominent troubadour, as well as the composition of lais by noblewomen of the 12th century.