Brigid is credited with founding a school of art, including metalwork and illumination, which Conleth oversaw. The Kildare scriptorium made the Book of Kildare, which drew high praise from Gerald of Wales (Giraldus Cambrensis), but disappeared during the Reformation. According to Giraldus, nothing that he ever saw was at all comparable to the book, every page of which was gorgeously illuminated, and the interlaced work and the harmony of the colours left the impression that "all this is the work of angelic, and not human skill".