People: May 9, 1969

Champagne corks popped, glasses of ouzo were hoisted, and a chocolate cake was trundled out bearing the whipped-cream legend: "To Alexander, the Pride of the Family." The family had gathered at Aristotle's seaside villa south of Athens to celebrate the 21st birthday of Alexander Onassis, heir apparent to his father's fortunes. Earlier, the soft Aegean wind had carried rumors that Alexander would commemorate his coming of age by defying his father and announce plans to marry New Zealand-born Fiona Thyssen, 36, his frequent companion and 16 years his senior. But Ari is a tough man to defy. When the birthday party...

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