He married Athina Livanos (1926-1974) in 1946, with whom he had two children; Alexander (1948-1973) and Christina (1950-1988). In the late 1950s, he met diva Maria Callas and began a liaison with her that led to his divorce. In 1968, he startled the world by marrying Jacqueline Kennedy, the widow of slain President John F. Kennedy.