Odo II, Viscount of Porhoët
Odo II, Count of Porhoet (died after 1180) was the son of Geoffroy, Viscount de Porhoët, and his wife Hawise (possibly Fergant). He became Duke of Brittany in 1148, jure uxoris, upon his marriage to Bertha, Duchess of Brittany. On Bertha's death, Odo II denied her son Conan IV of Penthièvre, Duke of Brittany his inheritance. While Odo II's marriage to Bertha was his first, it was her second marriage, her first being to Alain 'le Noir' de Penthièvre, Lord of Richmond (Alan, 1st Earl of Richmond). Odo II allied with his brother -in-law, Hoèl, Count of Nantes. Odo II was deposed by his stepson Conan IV in 1156, and taken prisoner by Conan IV's ally Raoul de Fougères. He married secondly, in 1167, a daughter of Guihomar IV, Viscount of Léon and his wife Nobilis, sometimes identitifed by the names Eleanor or Joan by later authors Issue. Odo II had two children by Bertha: Odo and his second wife had two children