Thailand's King Bhumibol Adulyadej, worth $30 billion
Brunei's Sultan Haji Hassanal Bolkiah, worth $20 billion
Saudi Arabia's King Abdullah bin Abdulaziz Al Saud, worth $18 billion
UAE's President Sheikh Khalifa bin Zayed al-Nahayan, $15 billion
Liechtenstein's Prince Hans-Adam II, worth $3.5 billion
Morocco's King Mohammed VI, worth $2.5 billion
Qatar's Sheikh Hamad bin Khalifa al-Thani, worth $2.4 billion
Prince Albert II of Monaco, worth $1 billion
His Highness the Aga Khan, worth $800 million
Oman's Sultan Qaboos bin Said, worth $700 million
Kuwait's Sheikh Nasser Al-Mohammad Al-Ahmad Al Jaber Al-Sabah, worth $350 million
Swaziland's King Mswati III, worth $100 million
