The noble Breton family line of Porhoët () is represented in modern times by the Franco-Breton House of Rohan. History The first recognised Vicomte de Porhoët was Guithenoc (abt. 990-1040CE), was born in Guilliers. He married Allurum (994-?) of Guilliers. He became Vicomte, and in about 1008 he moved to La Trinite, in Porhoet. Both Guilliers and Porhoet are located in the modern day French departement of Morbihan in the province of Brittany. In Porhoët Guithenoc built Josselin Castle, which he named for his son, Josselin (1020–1074). It is still owned by the descendants of Porhoët and is the longest continuously held private estate in the world. Vicomte Josselin de Porhoët had three sons with the surname Rohan: Mainguy De Rohan, Jostho de Rohan, and Roger de Rohan. He had a fourth son, the third vicomte de Porhoët, Odo I, Viscount of Porhoët (1049-?). Odo I married Anne de Leon (1065-?). They had two children, Vicomte Geoffrey de Porhoët (1092–1141) and Alan I, Viscount of Rohan. Geoffrey is said to have married Hawisa Fergant of Brittany (abt. 1105-?). They had two sons, one of which was Odo II, Viscount of Porhoët (1122-?). The title Count of Porhoët was joined to the Breton Ducal crown. Pierre Mauclerc bestowed the title on his daughter Yolande; upon her death the title was rejoined to the Duchy by her brother John I. Franco-Breton House of Rohan Alain le Noir was the 1st Viscount de Rohan. He was the third son of Eudes I de Porhoët and his wife Emma de Léon (the daughter of Guihomar II, Viscount of Léon). The name Rohan comes from the name of the castle he built, and passed on to his descendants, on the shores of the Oust. Viscount of Porhoët as Duke of Brittany Eudes II of Porhoët, also known as Odo II, is a notable figure in the history of the Duchy of Brittany. Odo II married into the ruling duchy of Brittany though his first marriage to Bertha (b.1114-?). This was Bertha's second marriage. She was the daughter of Conan III, Duke of Brittany. Upon Bertha's death, Odo II served as Regent to Bertha's son Conan IV of Penthièvre. Bertha and Odo II had three children permitting the Porhoët line to continue. Bertha's sister Constance (1118-?) was next in line to the duchy (after Bertha); she married Alan, younger brother to Odo II, thus cementing Porhoët