there are about sixty attestations of the welsh "brut" in the manuscripts. brynley f. roberts, citing j.j. parry and his own examination of the texts, places all the existing versions into six variant classes: 1) dingestow ms., 2) peniarth 44, 3) llanstephan 1, 4) peniarth 21, 5) cotton cleopatra b. v, and 6) the "brut tysilio".