Spain's King Juan Carlos and Queen Sofia are seen during their wedding ceremony in this May 14, 1962 photo in Athens, Greece. (Photo: AP)
Real Madrid's goalkeeper Iker Casillas, left receives the trophy from Spain's King Juan Carlos after Real Madrid beat FC Barcelona 1-0 during the final of the Copa del Rey soccer match at the Mestalla stadium in Valencia, Spain Wednesday April 20, 2011 (Photo: AP)
Pope Benedict XVI, right, and Spain's King Juan Carlos, shake hands during a farewell ceremony in honor of the Pope at El Prat airport in Barcelona , Spain, Sunday, Nov. 7, 2010 (Photo: AP)
Spain's King Juan Carlos (C) holds the World Cup trophy as he poses between Spain's national soccer team coach Vicente del Bosque (L) and Spain's captain Iker Casillas during a reception at Madrid's Royal Palace July 12, 2010 (Photo: Reuters)
FILE This is a May 1973 file photo of Spain's leader Francisco Franco, left, with his future successor as King, Prince Juan Carlos de Borbon, as they watch a military parade in Madrid (Photo: AP)
Spain's King Juan Carlos reviews the troops during a visit to the military air base of Zaragoza in this October 14, 2008 file photo (Photo: Reuters)
Spain's Crown Prince Felipe (2nd L) and King Juan Carlos talk as Princess Letizia (L) and Queen Sofia (R) watch a military parade during Spain's National Day in Madrid in this October 12, 2006 file photo (Photo: Reuters)
FILE - In this May 21, 2004 file photo, Spain's Princess Letizia and Prince Felipe, seen a day before their wedding day with King Juan Carlos, right, in Madrid (Photo: AP)
FILE - This is a Sunday, Nov. 14, 1999 file photo of Cuba's President Fidel Castro, left, and King of Spain Juan Carlos as they wave upon the King's arrival to the Havana's airport (Photo: AP)
FILE - This is a Friday Sept. 11, 2009 file photo of Spain's King Juan Carlos, left and Venezuelan President Hugo Chavez, at the Zarzuela Palace on the outskirts of Madrid (Photo: AP)
FILE - This is a Nov. 22, 1975 file photo King Juan Carlos speaks during his first official address as King during a ceremony where he was crowned and proclaimed King of Spain. Seated at left Queen Sofia (Photo: AP)