A volume containing a treatise on arms, copied in 1678 'allan or Llifr a fenthyciais i gan Sion Mathews o Ruabon'. It includes the arms of Arthur and other figures from Geoffrey of Monmouth's Historia from Brutus onward, arranged alphabetically and mixed up with historical personages; there are 178 entries in all (pp. 3-25). This is followed by tracts including 'Bonedd y Gwyr Gore' (pp. 25-28), and a letter from Thomas Maurice to Dr John Davies of Mallwyd (pp. 345-354).