Revealed: the world's wealthiest royals

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Forbes magazine has released its list of the world’s richest royals. Collectively, the group was worth $99bn last year, a decline of nine percent. (Getty Images)
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Thailand’s King Bhumibol Adulyadej is the world’s richest royal, reported to be worth $30bn. He is also the world’s longest-reigning monarch. (Getty Images)
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The Sultan of Brunei, Haji Hassanal Bolkiah is the second richest with a fortune of $20bn. (Getty Images)
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Saudi Arabia’s King Abdullah bin Abul Aziz is the first GCC ruler in the list. He is saw his fortune rise modestly last year to $18bn. (Getty Images)
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Sheikh Khalifa bin Zayed Al Nahayan, ruler of the UAE, is the fourth richest ruler according to Forbes, with a wealth totalling $15bn. (Getty Images)
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Dubai’s ruler Sheikh Mohammed bin Rashid Al Maktoum saw his wealth drop $7.5 billion in the aftermath of the Dubai World debt announcement. But his fortune of $4.5bn is still enough to secure him sixth place. (Getty Images)
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Seventh richest royal is Prince Hans-Adam II von und zu Liechtenstein, of Liechtenstein, reported to be worth $3.5bn. (Getty Images)
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The Moroccan King Mohammed IV is one of the youngest monarchs on the list aged 46. He is said to be worth $2.5bn. (Getty Images)
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Another GCC entry to the list is Qatar’s Sheikh Hamad bin Khalifa Al Thani, said to be worth $2.4bn. (Getty Images)
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In ninth place is Prince Albert II of Monaco, worth $1bn. (Getty Images)
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Number 10 on the list is Prince Karim Al Husseini, Aga Khan, with a fortune of $800m. A group of Pakistani women are seen working as part of the Aga Khan Rural Support Programme (AKRSP) headed by Al Husseini. (Getty Images)
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Sultan of Oman Qaboos bin Said is the 11th richest royal according to the list with a fortune of $700m. (Getty Images)
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The UK’s Queen Elizabeth II is ranked in 12th place with a personal wealth of $450m. She is the oldest reigning monarch in British history. (Getty Images)
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In thirteenth place is Kuwait’s Sheikh Sabah Al-Ahmad Al-Jaber Al Sabah, who is said to be worth $350m. (Getty Images)
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Queen Beatrix Wilhelmina Armgard, of the Netherlands, is the 14th richest royal with a wealth of $200m. (Getty Images)
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And in 15th place is King Mswati III of Swaziland, who is worth a total of $100m. (Getty Images)