Tour Solidor, Quai Sébastopol, 35400 Saint-Malo, France

Solidor Tower is a strengthened keep with three linked towers, located in the estuary of the river Rance in Brittany. It was built between 1369 and 1382 by John V, Duke of Brittany to control access to the Rance at a time when the city of Saint-Malo did not recognize his authority.

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