the version known as the "brut tysilio", attributed to the 7th-century welsh saint tysilio, became more widely known when its text was published in "the myvyrian archaiology of wales", a once-influential collection of welsh literary material whose credibility has suffered due the involvement of the antiquarian forger iolo morganwg, in 1801-1807. the editors did not place much faith in the attribution to tysilio, using that title merely to distinguish it from another welsh "brut" entitled "brut gruffudd ap arthur" (the chronicle of geoffrey son of arthur, an alternative name for geoffrey of monmouth). an english translation of the "brut tysilio" by peter roberts was published in 1811, and san marte made a german translation of roberts' english translation in 1854, making it available to non-specialists.