Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Conan IV of Penthièvre (1138 February 20, 1171), (Breton: Konan V Penteur, and Konan Breizh) called "the Young", was duke of Brittany, from 1156 to his death. He was son of Alan the Black, 1st Earl of Richmond and Bertha of Brittany. He was his mother''s heir as Duke Conan III. From his father s side, Conan was great great grandson of duke Geoffrey I and great grandson of Eudes of Brittany. Conan and his daughter Constance would be the only representatives of the Penthièvre dynasty of Brittany. With the death of his mother Bertha in early 1156, Conan IV expected to inherit the ducal throne. However, he was denied his inheritance by his stepfather Eudes, who refused to let go over his authority. Eudas may have entered into a pact with Hoel, Count of Nantes, to divide Brittany between them. But Hoel was under threat of rebellion in Nantes, sponsored by Geoffrey VI, Count of Anjou, and he could not send Eudas any aid. Within the year Conan IV was able to capture and imprison Eudas, and claim his inheritance.