Aristotle Onassis and Maria Callas 'never stopped seeing each other,' even after his marriage to Jacqueline Kennedy, his longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE.

Following the death of President John F. Kennedy, widow Jackie Kennedy remarried Greek businessman Aristotle Onassis in 1968, ...

New details the most mysterious love triangles of the 20th century, that of Aristotle Onassis Maria Callas and Jackie Kennedy ...

If you want to learn more about who the real Maria Callas was before watching Angelina's latest acclaimed performance—which ...

Jolie, whose combination of artistry and larger-than-life stardom makes her the only actress who could play this part right ...

Angelina Jolie glides through the final days of Maria Callas in Pablo Larraín’s “Maria." Currently playing in select theaters ...

There weren’t many people closer to Aristotle Onassis than Kiki ... She never spoke [directly] about Maria Callas. What she spoke of was Onassis's behavior. If I could characterize her, I ...

She never spoke [directly] about Maria Callas. What she spoke of was ... respect between Jackie and Aristotle Onassis. It was not a great love story.” Callas, on the other hand, was not as ...

Aristotle Onassis' longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE about his affair with Maria Callas Central Press/Getty; Ron Galella/Ron Galella Collection via Getty; Len ...