Founder and first abbot of Saint-Sauveur de Redon, intellectual centre of Carolingian Brittany.
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A priest and archdeacon of Vannes, Conwoion withdrew with five companions to marshland where the Vilaine meets the Oust, and founded there in 832 the abbey of Saint-Sauveur. Nominoë, leader of the Bretons, took it under his protection and made it the religious centre of the emerging Brittany; Louis the Pious confirmed the foundation. The Cartulary of Redon, compiled there, remains the richest source we have on ninth-century Breton society. When the Northmen destroyed Redon, he re-established a monastery near Plélan, where he died an octogenarian.