Constance of Penthièvre Breton noblewoman, Viscountess consort of Rohan (1140–1184) Parents Bertha, Duchess of Brittany Alan of Penthièvre, 4rd Lord of the Honour of Richmond, 1st Earl of Richmond Children Alain IV de Rohan Marguerite de Rohan Siblings Conan IV, Duke of Brittany Eudon Alice de Porhoët Reginald (?) Partners Alain III de Rohan