2001, Bonnie Wheeler, Fiona Tolhurst (editors), On Arthurian Women: Essays in Memory of Maureen Fries, Scriptorium Press, page 274, With this assumption, that Tintagel haunted Hardy from 1870 to 1923, it becomes possible to suggest that not only was his Tristanian work infused with his life-long themes, but that Tristanian themes may have subtly influenced his earlier works as well.
Source: wiktionary