Which Breton knight became Constable of France in 1370 during the Hundred Years’ War?

The Breton knight who became Constable of France in 1370 was Bertrand du Guesclin.

Du Guesclin was born in Brittany around 1320 and rose through warfare during the Hundred Years’ War. He supported the French Valois cause against England and the factions allied with the English crown. His early reputation grew during fighting in Brittany and Normandy, where he became known for persistence and tactical skill rather than for the polished tournament image often associated with chivalry.

King Charles V appointed him Constable of France in 1370, making him the kingdom’s senior military officer. Du Guesclin helped recover much of the territory that English forces had captured earlier in the war. His campaigns frequently relied on sieges, raids, and strategic pressure instead of seeking one decisive open battle.

He died at Châteauneuf-de-Randon in 1380. His career made him one of the most celebrated French military figures of the fourteenth century.