King Arthur sat upon the one, and upon the other he made Erec sit, who was robed in watered silk. As we read in the story, we find the description of the robe, and, in order that no one may say that I lie, I quote as my authority Macrobius, who devoted himself to the description of it. Macrobius instructs me how to describe, according as I have found it in the book, the workmanship and the figures of the cloth. Four fairies had made it with great skill and mastery. One represented there geometry, how it estimates and measures the extent of the heavens and the earth, so that nothing is lacking there; and then the depth and the height, and the width, and the length; then it estimates, besides, how broad and deep the sea is, and thus measures the whole world. Such was the work of the first fairy. And the second devoted her effort to the portrayal of arithmetic, and she strove hard to represent clearly how it wisely enumerates the days and the hours of time, and the water of the sea drop by drop, and then all the sand, and the stars one by one, knowing well how to tell the truth, and how many leaves there are in the woods: such is the skill of arithmetic that numbers have never deceived her, nor will she ever be in error when she wishes to apply her sense to them. The third design was that of music, with which all merriment finds itself in accord, songs and harmonies, and sounds of string, of harp, of Breton violin, and of viol. This piece of work was good and fine; for upon it were portrayed all the instruments and all the pastimes. The fourth, who next performed her task, executed a most excellent work; for the best of the arts she there portrayed. She undertook astronomy, which accomplishes so many marvels and draws inspiration from the stars, the moon, and the sun. Nowhere else does it seek counsel concerning aught which it has to do. They give it good and sure advice. Concerning whatever inquiry it make of them, whether in the past or in the future, they give it information without falsehood and without deception. This work was portrayed on the stuff of which Erec’s robe was made, all worked and woven with thread of gold.
Arthurian Romances, by Chrétien de Troyes.  
Page 88.
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