Jeanne de Clisson (1300–1359), also known as Jeanne de Belleville and the Lioness of Brittany, was a French / Breton former noblewoman who became a privateer to avenge her husband after he was executed for treason by the French king. She crossed the English Channel targeting French ships and often slaughtering their crew. It was her practice to leave at least one sailor alive to carry her message to the King of France.