The Sultan of Brunei, (also known as Hassanai Bolkiah Mu'izzaddin Waddaulah) has an estimated net worth of $20 billion, and rightly so. Born on July 15, 1946, in Brunei Town, the Sultan was already the crown prince by 1961, and became sultan in October of 1967. Incidentally, he also has many honorary doctorates from universities, including the National University of Singapore, and the University of Oxford, England, UK. As Sultan, he has complete and totally authority. As if that wasn't satisfying enough, he is the Prime Minister of Brunei as well.