Answer
Jeanne's first son was Henry III, who became King of France in 1574 at the age of 9. He was the son of Jeanne's second husband, Henry II, and her first son, Francis II. Henry III was a weak and indecisive ruler, and his reign was marked by political instability and religious conflict. He was assassinated in 1589 by a fanatical Catholic monk, Jacques Clément.