1: King Bhumibol Adulyadej - Thailand - Net worth: $35 billion
2: Sheikh Khalifa bin Zayed Al Nahyan - United Arab Emirates - Net worth: $23 billion
3: King Abdullah bin Abdul Aziz - Saudi Arabia - Net worth: $21 billion
4: Sultan Haji Hassanal Bolkiah - Brunei - Net worth: $20 billion
5: Sheikh Mohammed bin Rashid - Al Maktoum Dubai - Net worth: $18 billion
6: Prince Hans-Adam II von und zu Liechtenstein - Liechtenstein - Net worth: $5 billion
7: Sheikh Hamad bin Khalifa Al Thani - Qatar - Net worth: $2 billion
8: King Mohammed VI - Morocco - Net worth: $1.5 billion
9: Prince Albert II - Monaco - Net worth: $1.4 billion
10: Sultan Qaboos bin Said - Oman - Net worth: $1.1 billion
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According to Tatiana Serafin