Olivier de Clisson , 1336-1407, French soldier, b. Brittany. He fought on the English side in the War of the Breton Succession but entered the French service as companion in arms to Bertrand Du Guesclin . In 1380 he became constable of France. He defeated (1382) the insurgents of Ghent under Philip van Artevelde at Roosebeke (modern-day Westrozebeke). One of the Marmousets , he made use of his position to satisfy his boundless avidity; he became one of the richest men of his time. After King Charles VI became (1392) insane, Clisson retired to Brittany, where he served as guardian...
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