Henri du Couëdic de Kerérant is issued from a very ancient noble family from Brittany dating back from the crusades (7th Crusade) and with a strong naval tradition. One of his ancestors was Ollivier du Couëdic de Kerdrain, Secrétaire Général des galéres, during the Regency (from 1713 until 1738) in France. His grandson Michel du Couëdic de Kerérant followed in his tracks as a capitaine de Vaisseau in the French Navy.