Disgrifiad
RCAHMW drawing showing mason's marks at a number of sites, including Criccieth Castle; Conway Church;Bishop's Palace, Gogarth; Clynnog-Fawr Church; Bangor Cathedral; Maenan Abbey, Gwydir and Gwydir-Uchaf Chapel, published in RCAHMW Caernarvonshire inventory, fig nos 29-33.
