Walter V of Brienne

Walter V of Brienne (c. 1275–1311) was the only son of Hugh of Brienne and Isabella de la Roche, heir to Brienne and Lecce. As a boy he was a hostage for years in Augusta, and he was captured again in Sicily in 1299, freed by the Treaty of Caltabellotta in 1302.

He succeeded his cousin Guy II as duke of Athens in 1308, after a court rejected the claim of another cousin, Eschiva of Ibelin. He hired the Catalan Company against Thessaly, but withheld their pay; they defeated and killed him at Halmyros on 15 March 1311 and seized the duchy.