Based upon the life of Jacqueline Kennedy who was married to President John F. Kennedy and Greek shipping magnate Aristotle Onassis.
Anthony Quinn later played Aristotle Onassis' father Socrates Onassis in Onassis: The Richest Man in the World (1988).
In addition to the fictionalized version renamed James Cassidy for this movie, James Franciscus plays the real John F. Kennedy in Jacqueline Bouvier Kennedy (1981).
Reportedly, the real life Jacqueline Kennedy was offered US $1 million by producer Nico Mastorakis to portray herself in this major motion picture alongside Anthony Quinn according to an article published in the 12th June 1975 edition of 'The Los Angeles Times' newspaper. Reportedly, a spokesperson for Mrs. Onassis dispensed the notion of her playing herself in a movie as ''nonsense''.
Many movie posters for the film featured a long blurb that read: ''She was the most famous woman in the world. He was a peasant, a pirate, a shark. What he couldn't buy with money he stole with charm.''