Gothic architecture was eminently a product of the Isle de France. "France not only _led_," says Mr. Lethaby, "but _invented_. In a very true sense what we call Gothic is Frenchness of the France which had its centre in Paris." The thirteenth century rivals the finest period of Greek art for purity, simplicity, nobility and accurate science of construction. Imagination was chastened by knowledge, but not systematised into rigid rules. Each master solved his problem in his own way, and the result was a charm, a variety, and a fertility of invention, never surpassed in the history of art. Early French sculpture is a direct descendant of Greek art, which made its way into Gaul by the Phoenician trade route, and the Merovingian Franks were always in touch with the Eastern Mediterranean, and with the stream of early Byzantine[60] art. French artists achieved a perfection in the representation of the human form which anticipated by a generation the work of the Pisani in Italy, for the early thirteenth-century statues on the west front of Chartres Cathedral are carved with a naturalness and grace which the Italian masters never surpassed, and the marvellously mature and beautiful silver-gilt figure of a king, in high relief, found in 1902 immured in an old house at Bourges and exhibited in 1904 among the Primitifs Français at the Louvre, was wrought more than a century before the birth of Donatello. Some fragments of the old sculptures that adorned St. Denis and other twelfth and thirteenth-century churches may still be found in the museums of Paris. The influence of the French architects, as Emile Bertaux has demonstrated in the first volume of his _Art dans l'Italie Méridionale_, extended far beyond the limits of France, and is clearly traceable in the fine hunting-palace, erected for Frederic II. in the thirteenth century, at Castello del Monte, near Andria, in Apulia. But of the names of those who created these wonderful productions few are known; the great masterpieces of the thirteenth century are mostly anonymous. Jean de Chelles, one of the masons of Notre Dame, has left his name on the south portal and the date, Feb. 12, 1257, on which it was begun, "in honour of the holy Mother of Christ." He was followed by Pierre de Montereau, "master of the works of the church of Blessed Mary at Paris," whose name thus appears in a deed of sale dated 1265. The Sainte Chapelle is commonly attributed to Pierre de Montereau, but the attribution is a mere guess.