Retz is a historical subregion of Brittany, France located on the southern shore of the Loire estuary and the Breton marshlands. During the late 9th century, Retz was a Viking principality ruled by Hastein from Reze, and he launched several raids up the Loire River into West Francia and against targets as far as the British Isles and the Mediterranean. In the centuries after the Breton reconquest of Retz in the early 10th century, Brittany and Anjou warred over possession of the region, and, later in the Middle Ages, it became the home of the notorious serial killer Gilles de Rais, who had fought for France in the Hundred Years' War. During the War in the Vendee in 1793, Retz was a royalist stronghold.
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