Nantes Cathedral, or the Cathedral of St. Peter and St. Paul of Nantes, is a Roman Catholic Gothic cathedral located in Nantes, Pays de la Loire, France. Construction began in 1434, on the site of a Romanesque cathedral, and took 457 years to finish in 1891. It has been listed since 1862 as a monument historique by the French Ministry of Culture.

John V, sometimes numbered as VI, bynamed John the Wise, was Duke of Brittany and Count of Montfort from 1399 to his death. His rule coincided with the height of the Hundred Years' War between England and France. John's reversals in that conflict, as well as in other internal struggles in France, served to strengthen his duchy and to maintain its independence.