Selvatico, although the champion of the Veneto-Friuli theory, is constrained almost in spite of his own arguments to own that the Lombard architects had their part in early Venetian architecture, saying--"Although the prevalent architecture of Venice from the seventh to the thirteenth centuries consists of Byzantine and Roman elements, yet after A.D. 1000 another element mingled with it, which though partly the product of the two, nevertheless had in itself elements so original as to be truly national. This is the art which modern writers style Lombard, which, born first in Lombardy, diffused itself over the greater part of Italy, and then crossing the Alps expanded greatly in Northern Europe."[127] The learned Domenico Salazari is at the head of the Siculo-Norman theory, but the influence of the mingling of Oriental and Saracenic architecture with the Norman and Lombard elements in Sicily are so well known, and so fully acknowledged, that it is useless to go over his prolix arguments. It seems to me that each party is right as far as it goes. Venetian architecture has Oriental elements in it; the Tuscan Renaissance truly dates from Niccolò Pisano, and the Romanesque style was formed by the marriage of north and south in Sicily; but none of their advocates have got hold of the missing link in the development of each special school from the old classical styles. And that missing link, if anywhere, is to be looked for in the Comacines. In the ninth century they went northward, and laid the seeds of the round-arched Norman architecture at Dijon, under S. Guglielmo; a seed which took root and developed. In the next century they appear to have planted the seed of French Gothic at Aix-la-Chapelle, and of German Gothic at Cologne and Spires, and these grew to be goodly trees. In the eleventh century they again met their brethren of the north in Sicily; and all worked together, adding to their own beauties those of the rich and varied Saracenic style--and the Romanesque style was thus formed. The Venetian link dates about the same era. Fortunato, the Patriarch of Aquileja, called in the Comacines about A.D. 828, and their churches there show a groundwork of form and masonry quite Romano-Lombard, with an ornamentation of which it is difficult to say whether it be more Byzantine than Comacine, the two being so similar in conception, and the distinctive difference in technical work being at this distance of time not always distinguishable. Where the Byzantines worked in sandstone, the sharp edges of their precise cutting would have worn off during many centuries; and where the Comacines worked in marble, their marvellous knots and interlacings may look as clean-cut now as any time-worn Byzantine sculptures. In any case the union of Lombard and Byzantine in Venice was the forging of the link connecting Venetian art to the classic Roman.