Master James of Saint George (c. 1230–1309; French: Maître Jacques de Saint-Georges, Old French: Mestre Jaks, Latin: Magister Jacobus de Sancto Georgio) was a master of works/architect from Savoy, described by historian Marc Morris as "one of the greatest architects of the European Middle Ages". He was largely responsible for designing King Edward I's castles in North Wales, including Conwy, Harlech and Caernarfon (all begun in 1283) and Beaumaris on Anglesey (begun 1295).
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