UAE president Sheikh Khalifa Bin Zayed Al-Nahyan has been ranked second in a list of the world's richest royals.
The ruler of Abu Dhabi's fortune of approximately $24 billion was topped only by the King of Thailand's $36 billion. Meanwhile, Sheikh Mohammed Bin Rashid Al Maktoum, ruler of Dubai, was ranked fifth with an estimated fortune of $18 billion.
Elizabeth II, the Queen of England, is now the world's 12th richest monarch after slipping one place in the royal rich list published by Forbes Magazine.
Top of the royals, according to the list, is King Bhumibol Adulyade - the world's longest-reigning monarch - who bumped last year's winner the Sultan of Brunei out of first place.
Estimates of the Thai king's fortune rose seven-fold since last year due to increased transparency over his holdings.
The Sultan of Brunei - one of only two rulers to see their wealth fall during the year - is now in fourth place with an estimated fortune of $20 billion.
Ahead of him is the UAE's Sheikh Khalifa and King Abdullah Bin Abdulaziz of Saudi Arabia, who was ranked third with a fortune of about $21 billion.
As a whole the monarchs grew richer, seeing their collective wealth increase to $128 billion.
Middle Eastern royals have done particularly well during the past 12 months with the price of oil soaring.
The richest royals:
1. King Bhumibol Adulyade of Thailand
2. Sheikh Khalifa Bin Zayed Al-Nahyan of the United Arab Emirates
3. King Abdullah Bin Abdulaziz of Saudi Arabia
4. Sultan Haji Hassanal Bolkiah of Brunei
5. Sheikh Mohammed Bin Rashid Al Maktoum of Dubai
6. Prince Hans-Adam II von und zu Liechtenstein of Liechtenstein
7. Sheikh Hamad Bin Khalifa Al Thani of Qatar
8. King Mohammed IV of Morocco
9. Prince Albert II of Monaco
10. Sultan Qaboos bin Said Al Said of Oman