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Saint-Malo Cathedral (Cathédrale Saint-Vincent-de-Saragosse de Saint-Malo) is a Roman Catholic Cathedral located in Saint-Malo, Brittany. The church was founded in dedication to Saint Vincent of Saragossa, and constitutes a national monument of France. It was built in a mix of Roman and Gothic styles during the episcopacy of Jean de Châtillon (1146-1163) on the site of an ancient church founded in the 7th-century.

The former Breton and French Catholic Diocese of Saint-Malo existed from at least the 7th century until the French Revolution. Its seat was at Aleth up to some point in the 12th century, when it moved to Saint-Malo. Its territory extended over some of the modern departments of Ille-et-Vilaine, Côtes-d'Armor, and Morbihan.