Aristotle Onassis and Maria Callas 'couldn't live without the other one,' his longtime personal secretary Kiki Feroudi ...

Aristotle Onassis' longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE about his affair with Maria Callas ...

Jon Collins-Black is sending treasure hunters on an expedition to find hidden chests with a combined prize value of more than ...

whom she fondly calls “Aristo,” and the opera diva Maria Callas — while he was married to Jacqueline Kennedy Onassis, then the most famous woman in the world. Complicated would be an ...

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 ...

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