Well before it became the commune of Rohan, the place known as Roc'han, saw the foundation of a line of lords and masters who adopted the name of the place where they lived. Two centuries later, Pontivy became the seat of their viscountcy and later the seat of their duchy. Both political and military strategists, the Rohan family were also great builders, their chapels, manor houses, castles and palaces have left their mark not only on the architectural heritage of Brittany, but also Bordeaux.