English stained glass window from c. 1350–77, showing the coat of arms of Edward III, which featured the three lions of England quartered with the fleurs-de-lys of France.[1]Edward III, first English king to claim the throne of France
From 1340-1800 many English and later British monarchs claimed the throne of France. The origin of the claims come from Edward III's territorial claims of France which he claimed gave him the right to be king. He tried to take the throne of France and started the Hundred Years' War.[2]
↑Maclagan, Michael; Louda, Jiří (1981). Line of Succession: Heraldry of the Royal Families of Europe. London: Macdonald & Co. p. 17. ISBN0-85613-276-4.