From dwindling oil supplies to massive charitable donations, the wealth of the world’s royals is almost always in flux.

On Monday, it was Queen Elizabeth II whose fortune was on the line: The new British government is set to review the Queen’s cut of the profits of the Crown Estate after the property portfolio saw a spike in profits. In other words, the monarch could lose several tens of million in the coming years from her wealth of about $500 million.

Below, take a look at 10 of the richest royals in the world, whose personal fortunes were estimated by Forbes.

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