John's apprenticeship ended, and he in turn started on his travels, Hubert would appear to have removed to Holland, where painters and miniaturists of the early years of the fifteenth century repeatedly exhibit marked traces of his influence; where also miniatures in a Book of Hours, of date 1412 to 1417, to the order of Count William for the use of his only daughter, the fair and ill-starred Jacqueline, are judged to have been executed by him on the strength of the many points of resemblance they bear to the Great Polyptych. The commission of the latter work itself is now confidently attributed to the same prince. Observe the prominence given to the tower of Saint Martin's at Utrecht and the adjacent view of Cöln in the centre-piece, "The Adoration of the Lamb," and to St. Martin himself, the patron saint of Utrecht, in the panel of "The Knights of Christ," the banner in his grasp, moreover, charged with the arms of that town: the Count's territory was in the diocese of Utrecht and the ecclesiastical province of Cöln. So much depends on the origin of this commission in apportioning the respective share each of the brothers had in its execution that the further fact must not be overlooked that Ghent, for which the great work was completed, had no sort of connection with either Utrecht or Cöln, being in the diocese of Tournay and the ecclesiastical province of Rheims, while the only saint in the altar-piece specially connected with Ghent who is characterised by an emblem--St. Livin, to wit--was also widely venerated in Zeeland. Finally, not to labour this aspect of the question unduly, the inscription on the frame attributes, not the picture's inception, but its completion, to Jodoc Vyt, the eventual donor--a form of words so singular as to admit of no other interpretation than the plain meaning the expression conveys.