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Athina Onassis Roussel is a French-Greek heiress and equestrian. She is the granddaughter and the only surviving descendant of Greek shipping magnate Aristotle Onassis. Her parents are Aristotle's daughter Christina Onassis and her fourth husband, Thierry Roussel. She began riding horses as a child and is now a competitive showjumper. Following Christina Onassis’s death, Athina became her sole heiress.