The history which has made his name celebrated, is entitled _Chronicon sive Historia Britonum_. This history, written in the British or Armorican language, was brought into England by Walter Mapes, otherwise Calenius, archdeacon of Oxford, a learned man, and a diligent collector of histories. Travelling through France, about the year 1100, he procured in Armorica, this ancient chronicle, and, on his return, communicated it to Geoffrey, who, according to Warton, (History of English Poetry,) was an elegant Latin writer, and admirably skilled in the British tongue. Geoffrey, at the request and recommendation of Walter, translated this British chronicle into Latin, executing the translation with some degree of purity, and fidelity, insomuch that Matthew Paris speaking of him with reference to this history, says that he approved himself _Interpres verus_. With whatever fidelity the translation might be made, Geoffrey, however, was guilty of several interpolations, for he confesses that he took some part of his account of king Arthur’s achievements, from the mouth of his friend Walter, the archdeacon. He also owns that the account of Merlin’s prophecies was not in the Armorican original. The speeches and letters were his own forgeries, and in the description of battles, he has not scrupled to make frequent variations and additions. Geoffrey dedicated his translation to Robert, Earl of Gloucester, natural son of king Henry the first; this, however, did not protect him from the lash even of his contemporaries, for his fables, it appears, were soon discovered, and William Neubrigensis, who lived about the same time, in the beginning of the history which he wrote, thus speaks of him; “In these days a certain writer is risen, who has devised many foolish fictions of the Britons; he is named _Geoffrey_, and with what little shame, and great confidence does he frame his falsehoods.” William himself, however, did not escape censure for thus animadverting upon Geoffrey. It is difficult to ascertain at what period the original of Geoffrey’s history was compiled. The subject of it, when divested of its romantic embellishments, is a deduction of the Welsh princes, from the Trojan Brutus to Cadwallader, who reigned in the seventh century; and this notion of their extraction from the Trojans, had so infatuated the Welsh, that even so late as the year 1284, archbishop Peckham, in his injunctions to the diocese of St. Asaph, orders the people to abstain from giving credit to idle dreams and visions, a superstition which they had contracted from their belief in the dream of their founder Brutus, in the temple of Diana, concerning his arrival in Britain. The archbishop very seriously, advises them to boast no more of their relation to the conquered and fugitive Trojans, but to glory in the victorious cross of CHRIST.