Charles de Lorraine, duc de Mayenne was a French noble, governor, military commander and rebel during the latter French Wars of Religion. Born in 1554, the second son of François de Lorraine, duke of Guise and Anne d'Este, Mayenne inherited his fathers' position of Grand Chambellan in 1563 upon his death. He fought at the siege of Poitiers for the crown in 1569, and crusaded against the Ottomans in 1572. He served under the command of the king's brother Anjou during the siege of La Rochelle in the fourth war of religion, during which he was wounded. While the siege progressed, his uncle was killed by a cannonball, and he inherited his position as governor of Bourgogne. That same year, his marquisate of Mayenne was elevated to a duché pairie. He travelled with Anjou when he was elected as king of the Commonwealth and was a member of his court there until early 1574 when he departed on crusade again. Returning to France, he served in the fifth war of religion for Anjou, now king Henri III of France, but his badly underfunded army was unable to seriously impede the Protestant mercenary force under Casimir. He aligned himself with the Catholic Ligue that rose up in opposition to the generous Peace of Monsieur and fought in the sixth war of religion that resulted, serving at the sieges of La Charité-sur-Loire and Issoire. During 1576, he married Henriette de Savoie-Villars, securing a sizable inheritance in the south west, and the title of Admiral on the death of her father in 1578. Mayenne was granted full command of a royal army during the seventh war of religion in 1580, besieging the Protestant stronghold of La Mure successfully, and clearing several holdout towns after the peace. In 1582 he was obliged to surrender his title of Admiral to Joyeuse, a favourite of Henri. The following year he was involved in an abortive plan to invade England, though it came to nothing due to lack of funds.

The French Wars of Religion were a series of civil wars between French Catholics and Protestants from 1562 to 1598. Between two and four million people died from violence, famine or disease directly caused by the conflict, and it severely damaged the power of the French monarchy. One of its most notorious episodes was the St. Bartholomew's Day massacre in 1572. The fighting ended with a compromise in 1598, when Henry of Navarre, who had converted to Catholicism in 1593, was proclaimed King Henry IV of France and issued the Edict of Nantes, which granted substantial rights and freedoms to the Huguenots. However, Catholics continued to disapprove of Protestants and of Henry, and his assassination in 1610 triggered a fresh round of Huguenot rebellions in the 1620s.