Guihomar V, Viscount of Léon

Guihomar V of Léon (died after 14 March 1216) was a Viscount of Léon, son of Guihomar IV.

After the death of Guihomar IV, who had submitted to the ducal power not long before, Henry II confiscated the Viscount’s estates. After Morlaix was confiscated by Duke Geoffrey II Plantagenet, Guihomar IV’s two sons, Guihomar V and Harvey I, recovered their inheritance. Guihomar V received the castellanies of Lesneven, Brest, Saint-Renan and Le Conquet as well as the title of Viscount of Léon. Harvey I received the estates of Landerneau and Daoudour, as well as the lordship of Coat-Méal. Being a juveigneur, Harvey had to content himself with the title of Lord of Léon, which he passed on to his heirs, founding the junior branch of the House of Léon. The Lords of Léon settle in the castle of La Roche-Maurice.

In 1192, he and his wife Maencia make a donation to the priory of Locmaria.

In 1196, after Duchess Constance was imprisoned by her husband Ranulf of Chester, Guihomar, his brother Harvey and several other Breton lords rebelled and took Constance's son Arthur away from his uncle Richard.

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