Jean de Hangest, seigneur d'Yvoy, was a Protestant Huguenot military commander during the French Wars of Religion.
A member of the Protestant Huguenot party, he became a principal lieutenant of Admiral de Coligny.
However, the town was lost, causing the Prince Conde to lack confidence in both Jean and his brother François.
Encouraged by the King of France, Charles IX, to take the Protestant fight to the Netherlands, in 1572, Jean took 7,000 men to relieve the Spanish Siege of Mons, where he was taken captive, moved to Antwerp, and there he was strangled in his bed (11 July 1572).
[1] As the family was heavily in debt, and they had to sell the lands and title Genlis to Pierre Brûlart.