{{more footnotes, date=November 2018 Odo I of Porhoët was

viscount A viscount ( , for male) or viscountess (, for female) is a title used in certain European countries for a noble of varying status. In many countries a viscount, and its historical equivalents, was a non-hereditary, administrative or judicia ...

of Rennes and

Porhoët 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 ...

from 1074 to his death, after 1092. Odo I was the eldest son and heir of Josselin I of Porhoët. Contrary to his father, he seldom appeared at the court of Duke

Conan III, Duke of Brittany Conan III, also known as Conan of Cornouaille and Conan the Fat ( br, Konan III a Vreizh, and ; c. 1093–1096 – September 17, 1148) was duke of Brittany, from 1112 to his death. He was the son of Alan IV, Duke of Brittany and Ermengarde of An ...

. During the reign of Conan’s brother-in-law and heir Hoël of Cornouailles, he even joined several lords who had rebelled against the duke in 1068. He married firstly Anne, or Emma, de Léon, who died in 1092. She was the aunt of

Guihomar II, Viscount of Léon Guihomar II de Léon (died in 1103) was a Viscount of Léon. He is said to have succeeded his grandfather Guihomar I. Origins Guihomar is said to be the son of a man named Ehuarn. But according to Joëlle Quaghebeur, this Ehuarn was actually a ...

. They had five children: * Josselin II

Viscount A viscount ( , for male) or viscountess (, for female) is a title used in certain European countries for a noble of varying status. In many countries a viscount, and its historical equivalents, was a non-hereditary, administrative or judicia ...

of Rennes and

* Geoffrey Viscount of

* Guethenoc of Porhoët (died before 1114) * a daughter who married Simon II, Baron of La Roche-Bernard * Alan I of Rohan, 1st Viscount of Rohan in 1127 After Emma’s death, Odo married again. The name of his second wife is unknown. They had two sons: * Bernard of Porhoët * Robert of Porhoët

Sources

*Abbé Piéderrière, vicar of La Trinité-Porhoët ''Essai sur la généalogie des comtes de Porhoët''. Bulletin de la Société polymathique du Morbihan, 1872, pages 234-241. *Hubert Guillotel, ''De la vicomté de Rennes à la vicomté de Porhoët (fin du Xème siècle - milieu du XIIème siècle)'', MSHAB, 1995, wol. LXXIII, pages 5–30 *Pierre-Hyacinthe Morice
''Mémoires pour servir de preuves à l'histoire ecclésiastique et civile de Bretagne''
1742-1746 11th-century Breton people Porhoët family Viscounts of France