Daughter of the Grand-Duke of Tuscany, born at Florence; was married to Henry IV. of France in 1600, with whom she lived unhappily till his murder in 1610; she was then regent for seven years; in 1617 her son assumed power as Louis XIII.; she was for two years banished from the court, and on her return so intrigued as to bring about her imprisonment in 1631; though a lover of art she was neither good wife nor good queen, and escaping from confinement she died in destitution at Cologne (1573-1642).