Raoul II of Brienne
Raoul II of Brienne (1315–1350) succeeded his father Raoul I in 1344 as Count of Eu and Guînes and as Constable of France. In 1340 he married Catherine, daughter of Louis II of Vaud.
He was captured at Caen in 1346 and held prisoner in England. Allowed back to France in 1350 to raise his ransom, he was seized and beheaded without trial on John II's orders; rumour said he had pledged Guînes to the English.