Guillaume de Sens was too prominent to have copied another man's work, and since it is certain that the plan of Canterbury is his, it is now accepted that he built the cathedral of his native town before he proceeded to England. The homogeneous choir and nave of Sens show that they are the work of the years preceding 1175. And Guillaume's claim to be Sens' architect is further strengthened by a historic link. Not only did Thomas Becket spend three weeks with Archbishop Hugues de Toucy on his first arrival in the city during the pope's stay there, but, after quitting Pontigny, he passed some years in St. Colombe monastery by the town. Without a doubt he knew the master-of-works who was erecting the cathedral, and it may have been he who, on his return to his own see, made the French architect's skill known to his cathedral chapter. Guillaume was not called to Canterbury, however, till after the martyrdom of its great archbishop.
Sens Cathedral was completed by a prince of the reigning house of Champagne, a son of Thibaut the Great, Archbishop Guillaume-of-the-White-Hands (1168-76). He, too, was Becket's stanch supporter, and denounced his murder to the pope, though by blood he was Henry II's cousin. In 1178 he crossed to England to pray by the tomb of the newly canonized saint--one of the first of the Canterbury Pilgrims who for over three hundred years were to wend their way to the shrine in Kent. Through his influence, Becket's friend and adviser, John of Salisbury, the ablest scholar of his generation, was raised to the see of Chartres. Both William of Champagne and John of Salisbury received episcopal consecration from the hands of good Maurice de Sully, the builder of Paris Cathedral. In his later life Archbishop Guillaume was transferred to the see of Rheims, and in that cathedral he anointed as king his own nephew, Philippe-Auguste, whose prime minister he was; when Philippe II went on the Third Crusade he left as regents his uncle and his mother, Alix of Champagne. The archbishop's affection for his nephew led him to sanction the king's divorce from Ingeborg of Denmark and his marriage to Agnes of Méran, which drew on France the papal interdict, and on William of Champagne the censures of Innocent III.