Guise, and Guise agreed to provide them passage to safety from the violent crowd. Reign of Henri IV With the assassination of Henri III outside Paris, Biron was among the marshals that recognised the legitimacy of Navarre as king immediately, and went over to support him in his fights with the Ligue . He fought alongside the king at the Battle of Ivry in Normandy, where the leading Liguer Mayenne was defeated. He was killed by a cannonball at the siege of Épernay on 26 July 1592. Sources Sources 1524 births 1592 deaths House of Gontaut Marshals of France French military personnel killed in action French people of the French Wars of Religion