Island kingdom bounded to the west by the Marcher lordships and the (still contested) principality of Wales conquered by Edward I; English lordships included parts of modern south Wales (from southern Pembrokeshire through Swansea, Cardiff and on towards Gloucester in England); bounded to the north by the kingdom of Scotland, to the east by the North Sea and to the south by the Channel; included Somerset, Devon and Cornwall to the south-west. Population up to the Black Death of 1348-9 approximately 4 million souls.
John IV of Montfort, duke of Brittany (1365-1399), sometimes referred to as John V, the Conqueror. Through this marriage he was related to the English royal family. He remained devoted to the English cause. He owed his position to the victory won at Auray in 1364, and to the subsequent treaty of Guérande the following year.
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