Prince Albert (1848–1922), who reigned from 1889 to 1922, was famous as an oceanographer. In 1956, his great-grandson Rainier III (b.1923), reigning monarch since 1949, married Grace Patricia Kelly (1929–82), a US motion picture actress, whose death on 14 September 1982 following an automobile accident was mourned throughout Monaco. Their son, Prince Albert (b.1958) is the heir apparent; Princess Caroline (b.1957) and Princess Stéphanie(b.1965) are their daughters.