Aristotle Onassis had a longtime affair with opera singer Maria Callas that lasted until his death in 1975 at age 69. Callas is the subject of a biopic starring Angelina Jolie.

Aristotle Onassis and Maria Callas 'couldn't live without the other one,' his longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE. And Onassis' wife, Jackie Kennedy, knew about the ...

The real Maria Callas met Aristotle Onassis during her marriage to Giovanni Battista Meneghini. Callas and Meneghini were married from 1949 to 1959. They met in Italy in 1947, ...

Maria Callas visited her longtime lover Aristotle Onassis on his deathbed in a secret meeting arranged so that his wife Jacqueline Kennedy Onassis wouldn't find out. The moment is dramatized in ...

Aristotle Onassis and Maria Callas Even after Onassis married Jackie on Oct. 20, 1969. “He was proud of that,” recalls Moutsatsos, who attended the wedding on his private island of Skorpios.

Here, Maria Callas and Aristotle Onassis's complete relationship timeline: 1957: Maria Callas and Aristotle Onassis meet at a party thrown by Elsa Maxwell. Keystone-France // Getty Images.

When Aristotle Onassis, the Greek shipping magnate, met Maria Callas, the great opera diva, in 1957 they were both married to others. But that didn’t stop them from falling in love and having an ...

A Greek Cypriot purchased the legendary Aristotle Onassis aircrafts of Olympic Airways before they were destined for the ...

En Garde. Anyone who does business with Aristotle Onassis knows that he has to do so with his best weapons, his eyes wide open, and his wits and sharps as his sword.