• Even, a semi-legendary nobleman who lived c. 900. • Maybe Alan I of Léon, father of Guihomar I. •
Guihomar I (fl. c. 1021-1055). •
Morvan (fl. c. 1050). According to French historian Joëlle Quaghebeur, Morvan was not a viscount of Léon but a nobleman from Cornouaille. • Alan II of Léon, son of Guihomar •
Ehuarn (fl. c. 1066-1084), Morvan's son. Likewise, Joëlle Quaghebeur thinks Ehuarn was not a viscount of Léon but a nobleman from Cornouaille. •
Guihomar II (died 1103), who is said to have been Guihomar I's grandson. •
Harvey I (died after 1128). •
Guihomar III (died c. 1157). •
Harvey II (died c. 1168). •
Guihomar IV (died 1179). •
Guihomar V (died after 1216) controlled only a small portion of Leon; fought on the side of Duchess
Constance and Duke
Arthur I. •
Conan I, (died before 1231) fought and was captured with Duke
Arthur I; later attacked by Duke
Peter I. Lost the Battle of Chateaubriant in 1222, a rebellion of Breton nobles, which established the authority of Duchess
Alix and Duke Peter I. •
Guihomar VI (died c. 1239), rebelled against Duke
John I in 1237 •
Harvey III (c. 1239 - c. 1265), ceded the town, port and chateau of Brest to the duke of Brittany in 1240 •
Harvey IV (c. 1271 - c. 1298), sold much of the remaining riches of the viscounty •
Amé, daughter of Harvey IV, sold all her rights and definitively renounced them in 1298; the line of the viscounts of Leon becomes extinct •
Large portions of Viscounty held in the domain of the duke of Brittany (1179 - 1269) • Peter of Brittany (1269-1312), son of Duke
John II granted the viscountship by his father- to settle his debts, Peter resold the viscountship to his brother Duke
Arthur II of Brittany in 1293. The lordship (or "honour") of Leon passed to the House of Rohan in 1363. ==References==