The year 1241 added new treasures to those already acquired by St. Louis. These were also from Constantinople, and sent as expressions of the homage paid by the Emperor Baldwin to the “Most Christian King.” These relics were accompanied by a parchment document to establish their authenticity, and which especially designated three remarkable portions of the true cross: the first and largest, _Crucem Sanctam_; the second, _Magnam partem Crucis_; and the third, which was smaller, and known as the Cross of Victory, because it had been borne before the armies of Constantine and his successors, _Aliam crucem mediocrem quam Crucem Triumphalem veteres appellabant_. With these was sent also the point of the lance which had pierced our Saviour’s side, and which, from the beginning of the seventh century, had been kept in the chapel of the _Martyrion_, raised by Constantine on Mount Calvary over the very place of the Crucifixion. Heraclius, fearing lest the lance should fall into the hands of the Persians, sent it to Constantinople, from which the greater part of it was later taken to Antioch, where the Crusaders found it in 1097, but the point had been retained in the former city, and was sent from thence to Paris. It was also in the palace of the _Bucoleon_ at Byzantium that were for a long period preserved a portion of the purple robe, the reed, and the sponge of the Passion. Baldwin I., by means of certain concessions made to the other crusading princes, obtained that the chapel in this palace should remain undisturbed, and thus secured for himself the greater part of its treasures, which were so largely drawn upon by his successor for the benefit of St. Louis and of France. On their arrival the king immediately prepared to erect an edifice that should be as worthy as possible to receive relics so precious; nor were there wanting at that time great artists well able to furnish the design. The middle of the thirteenth century was perhaps the best and purest period of religious architecture. Churches and cathedrals then arose the majesty of whose beauty has never been surpassed or even equalled. For the execution of his work Louis chose his own architect, Pierre de Montereau, the most renowned master-worker in stone of the great school of Philippe Auguste, whom he charged to construct, in place of the chapel of St. Nicholas, which was old and ruinous, another which should be not so much a church as a delicate reliquary in stone, with open-worked carving like a filigree of gold, paved with enamel, and lighted by windows filled with richly-colored glass. The artist was no less ready to enter into the ideas of the king than he was competent to realize them. A plan, wonderful in the beauty of its proportions and the gracefulness of its design, was soon ready and submitted to the monarch’s approval, who found it so excellent that his one desire was to see it carried out as expeditiously as possible.