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Solidor Tower (in French tour Solidor) 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 (i.e. Jean IV in French) to control access to the Rance at a time when the city of Saint-Malo did not recognize his authority.

Aleth Cathedral (French: Cathédrale Saint-Pierre d'Aleth) was a Roman Catholic church located in Saint-Servan in Saint-Malo, Brittany, France. It was the cathedral of the diocese of Aleth.Aleth was a Gallo-Roman settlement on a peninsula on one side of the Rance estuary. The diocese was established in the 9th century.