Saudi Arabia Crown Prince Sultan bin Abdul-Aziz (C) is greeted by Saudi Princes upon his arrival at King Khalid International Airport December 11, 2009. The crown prince of top OPEC oil exporter Saudi Arabia returned to the kingdom on Friday after spending most of the year in Morocco following medical treatment in the United States. Prince Sultan, thought to be about 85, underwent an operation in New York in February and then went to Morocco, authorities said at the time without saying what he was suffering from.