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West Francia was a medieval kingdom that existed from 843 to 987, formed when the Frankish Empire was divided among the sons of Louis the Pious. It is historically significant as the predecessor to modern France and a major political power in early medieval Europe.
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In medieval historiography, West Francia (Medieval Latin: Francia occidentalis) or the Kingdom of the West Franks (Latin: regnum Francorum occidentalium) constitutes the initial stage of the Kingdom of France and extends from the Treaty of Verdun in 843 to 987, the beginning of the Capetian dynasty. It was created from the division of the Carolingian Empire following the death of Louis the Pious, with its neighbor East Francia eventually evolving into the Kingdom of Germany.
West Francia extended further north and south than modern metropolitan France, but it did not extend as far east. It did not include such future French holdings as Lorraine, the County and Kingdom of Burgundy (the duchy was already a part of West Francia), Alsace and Provence in the east and southeast for example. It also did not include the Brittany peninsula in the west.