Louis III, c.863–882, French king, son of King Louis II. He became joint ruler with his brother Carloman on the death of Louis II (879), despite the attempts of Louis the Younger to become French king. Louis III and Carloman fought against the secessionists of Burgundy and Provence and resisted an invasion of the Normans, whom Louis routed (881) at Saucourt. His death left Carloman sole ruler.
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