The House of Rohan is a French noble family of viscounts, later dukes and princes. They come from the area called Rohan in Brittany. Their line descends from the viscounts of Porhoët. It is said to trace back to the legendary Conan Meriadoc. Through the Porhoët, the Rohan are related to the Dukes of Brittany. They also later developed ties with the French and English royal houses. They played an important role in French and European history.