Jeanne de Clisson also known as the Lioness of Brittany, was a feared Breton

Breton people

The Bretons are an ethnic group located in the region of Brittany in France. They trace much of their heritage to groups of Brythonic speakers who emigrated from southwestern Great Britain in waves from the 3rd to 6th century into the Armorican peninsula, subsequently named Brittany after them.The...

 pirate who plied the English Channel

English Channel

The English Channel , often referred to simply as the Channel, is an arm of the Atlantic Ocean that separates southern England from northern France, and joins the North Sea to the Atlantic. It is about long and varies in width from at its widest to in the Strait of Dover...

 for French ships from 1343 to 1356.
She was born Jeanne-Louise de Belleville, Dame de Montaigu, the daughter of Maurice IV of Belleville-Montaigu and Létice de Parthenay, in 1300. At the age of 12, she was married to 19-year-old Geoffrey de Châteaubriant, by whom she had two children, Louise and Geoffrey.