1. Bhumibol Adulyadej, $30 billion
King of Thailand
The man being read to by Barack Obama (see number 19 on this list) is the richest world leader. He is currently the longest-serving head of state and has a great reputation in his country (well, so does Kim Jong-Un). He has a special fund that isn't private or public that manages his money, and they do well. Very well. He loves guns, jazz, and sailing. When Forbes valued his fortune, Thailand was a little upset, but they stood by their numbers. Since his earnings are technically secret, that's all we've got.