The castle of the dukes of Brittany Home > Tours > Walk in the Nantes protestant5 / 11 On the 15th of April 1598, Henri IV signed, very likely at the castle of the dukes of Brittany, the famous ‘perpetual and irrevocable edict of Tolerance’ awarding freedom of religion to the Protestants. The castle of the dukes of Brittany © Wikimedia Creative Commons A memorial plaque inside the castle attestes to the event. Progress in the tour Previous noteThe Carmélites street5/11Return to the routeFollowing note Little-HollandAssociated tours Walk in the Nantes protestant A protestant tour in the city of Nantes: discover 11 emblematic places of the presence of Protestants in the city of Nantes.