GREECE - SEPTEMBER 17: From left to right : the fiancee's brother the heir prince CONSTANTIN II of Greece, Queen FREDERICA of Prussia, DON JUAN CARLOS's father JUAN of BOURBON and Count of Barcelona, Princess SOFIA of Greece, the fiance JUAN CARLOS, MARIA de las Mercedes of BOURBON and princess of the two Sicilies on the engagement of Princess SOFIA of Greece and DON JUAN CARLOS in Athens. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
