His full name was quite mouthful and could hardly ring a bell to many; His Highness Prince Karim Al-Hussaini Aga Khan IV.
But to millions of people all over the world, he was simply the Aga Khan, or 'Commanding Chief', a hereditary title given to the 46th Imam of the Shia Ismaili Muslims, Hasan Ali Shah Aga Khan by Fath Ali Shah, a 19th Century monarch.