The absolute monarch of the desert kingdom controls 20% of the world's known oil reserves and guards Islam's holiest cities. The Arab Spring couldn't shake al Saud's sovereignty, but out-of-control youth unemployment remains a threat. Aging Abdullah lost his second heir apparent in two years when his brother, Crown Prince Nayef, died in June; he's been replaced by another brother, 76-year-old Crown Prince Salman, the former governor of Riyadh. Abdullah ranks 7th on Forbes list of World's Most Powerful People 2013. He is 89 and resides in Riyadh, KSA.