The Greek Tycoon (1978)
The Greek Tycoon is a 1978 American drama film directed by J. Lee Thompson. The screenplay by Morton S. Fine is based on a story by Fine, Nico Mastorakis, and Win Wells loosely based on Aristotle Onassis and his relationship with Jacqueline Kennedy. The film stars Anthony Quinn in the title role and Jacqueline Bisset as the character based on Kennedy. Quinn also appeared in Thompson's picture The Passage, released the following year.
More at Wikipedia.