John I, Count of Penthièvre

John I
Count of Penthièvre
Reign29 September 1364 – 16 January 1404
PredecessorCharles and Joan
SuccessorOlivier
Born(1345-02-05)5 February 1345
Jurgon-les-Lacs, Brittany (France)
Died16 January 1404(1404-01-16) (aged 58)
Lamballe, Brittany
SpouseMargaret de Clisson
IssueOlivier
John
Charles d'Avaugour
William de Limoges
Joan, lady of Belleville
HouseHouse of Châtillon
FatherCharles of Blois
MotherJoan, Duchess of Brittany

John I (5 February 1345 – 16 January 1404), was Count of Penthièvre and Viscount of Limoges from 1364 to 1404, and the Penthièvre claimant to the Duchy of Brittany.