The Dukes of Brittany were crowned with a royal crown said to be that of the former kings of Brittany in a ceremony designed to emphasise the royal ancestry and sovereignty of the reigning duke.
A los duques de Bretaña se les corona con una corona real que se dice que es la de los antiguos reyes de Bretaña, en una ceremonia destinada a resaltar la ascendencia real y la soberanía del duque reinante.