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On board Aristotle Onassis' floating palace: Superyacht that hosted tycoon's wedding party to Jackie O and was the height of 1950s opulence goes on sale for $21MILLION Built in 1943, the Christina O was bought by shipping tycoon Aristotle Onassis for $34,000 in 1954 Onassis hosted star-studded parties on board during the late 1950s Guests included John F Kennedy, Winston Churchill, Frank Sinatra, Marilyn Monroe and Elizabeth Taylor In 1956 Princess Grace and Prince Rainier held their wedding reception on the yacht