John III, Count of Sancerre

John III of Sancerre (1334–1402) became count in 1346 after his father Louis II fell at Crécy. Captured at Poitiers in 1356, he was named among the hostages for the Treaty of Brétigny in 1360, and in 1364 destroyed an English company near La Charité.

He married Marguerite de Marmande in 1357 and later Constance of Saluzzo. Counselor and chamberlain of Charles VI, he died in March 1402 leaving only daughters, ending the male line of the house of Blois-Champagne.