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King Hassan II of Morocco, former Prince Moulay Hassan, riding a horse waves to well-wishers 26 February 1961 in Casablanca after he acceded the throne on the death of his father King Muhammad ibn Yousuf. He is the 20th of the Filali line of sharifs, or descendants of the Prophet, who have ruled Morocco since 1631. (Photo credit should read -/AFP/Getty Images)

King Hassan II of Morocco, former Prince Moulay Hassan, riding a horse waves to well-wishers 26 February 1961 in Casablanca after he acceded the throne on the death of his father King Muhammad ibn Yousuf. He is the 20th of the Filali line of sharifs, or descendants of the Prophet, who have ruled Morocco since 1631.  (Photo credit should read -/AFP/Getty Images)