After the assassination of King Henri III of France in 1589, Jean VI d'Aumont, a soldier and Marshal of France, shifted his loyalties to support Henry of Navarre (later King Henri IV). Jean VI d'Aumont aligned himself with Henry of Navarre during the latter's campaign to solidify control over France, facing strong Catholic opposition (Warfare History Network).
Here is an image depicting Jean VI d'Aumont:
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