Catherine de' Medici (Italian: Caterina de' Medici pronounced [kateˈriːna de ˈmɛːditʃi]; French: Catherine de Médicis pronounced [katʁin də medisis], 13 April 1519 – 5 January 1589), daughter of Lorenzo II de' Medici and of Madeleine de La Tour d'Auvergne, was an Italian noblewoman who was Queen of France from 1547 until 1559, as the wife of King Henry II. As the mother of three sons who became kings of France during her lifetime, she had extensive, if at times varying, influence in the political life of France. For a time, she ruled France as its regent.

In 1533, at the age of fourteen, Catherine married Henry, second son of King Francis I and Queen Claude of France. Under the gallicised version of her name, Catherine de Médicis, she was Queen consort of France as the wife of King Henry II of France from 1547 to 1559. Throughout his reign, Henry excluded Catherine from participating in state affairs and instead showered favours on his chief mistress, Diane de Poitiers, who wielded much influence over him. Henry's death thrust Catherine into the political arena as mother of the frail fifteen-year-old King Francis II. When he died in 1560, she became regent on behalf of her ten-year-old son King Charles IX and was granted sweeping powers. After Charles died in 1574, Catherine played a key role in the reign of her third son, Henry III. He dispensed with her advice only in the last months of her life.

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