Carlos Slim Helú's financial might has led some people to nickname his native Mexico ‘Slimlandia’. He dominates the country’s businesses, from telecoms to construction. But how did a man whose hero happens to be the Mongol warlord Genghis Khan get to be the richest person in the world? Many have...

Roman Abramovich was known as the "stealth oligarch" before he stepped into the limelight as Chelsea football club’s sugar daddy owner. The man loves a yacht: his largest cost $427m, and has bullet-proof windows and an escape submarine. Abramovich made his fortune from post-Soviet privatisation,...