Bertha, Duchess of Brittany French politician (1114–1156) Parents Matilda FitzRoy, Duchess of Brittany Conan III, Duke of Brittany Children Alice de Porhoët Constance of Penthièvre Conan IV, Duke of Brittany Eudon Siblings Hoel, Count of Nantes Constance de Bretagne Partners Alan of Penthièvre, 4rd Lord of the Honour of Richmond, 1st Earl of Richmond Odo, Viscount of Porhoet