A Saudi billionaire detained in a 2017 anti-graft crackdown will sell a 16.87 percent stake in his company to a sovereign wealth fund run by the kingdom’s crown prince. a statement issued on Sunday.

According to a regulatory filing published by the Saudi stock exchange, or Tadawul, Prince Al-Waleed bin Talal sold 625 million shares of the Riyadh-based Kingdom Holding Company for approximately $1.5 billion.

The company owns the famed George V hotel in Paris and has a majority stake in The Savoy in London, according to a breakdown of its portfolio on its website.

Al-Waleed, once dubbed the Warren Buffett of Saudi Arabia, struggled to recover his political and financial standing in the kingdom after he was targeted and detained in a crackdown on alleged corruption in 2017.

He was rounded up with more than 300 other prominent Saudis in the anti-graft campaign and held at the Riyadh Ritz-Carlton.

Critics have said the move was a power grab by Al-Waleed’s cousin Crown Prince Mohammed bin Salman, who had been named heir to the throne just a few months earlier.

In January 2018, Al-Waleed was freed, gaunt but seemingly unharmed, after nearly three months in detention.

He declared the ordeal a misunderstanding that had been cleared up, as news swirled that he had reached an undisclosed financial settlement with authorities in return for his freedom.

Crown Prince Mohammed is chair of the sovereign wealth fund, known as the Public Investment Fund, which is at the heart of Saudi Arabia’s efforts to end its reliance on oil.

More recently, Al-Waleed has sparred with Tesla and SpaceX CEO Elon Musk over his bid to buy Twitter.

When Musk unveiled his bid in April, Al-Waleed was among the investors who spoke out against it, saying it did not reflect Twitter’s “intrinsic value… given its growth prospects”.

However, in early May, Al-Waleed changed his tune, revealing in a filing that he had agreed to contribute approximately 35 million Twitter shares worth $1.9 billion in order to retain a stake in the company following the acquisition.

The Twitter bid has since been halted as Musk requests proof of the number of Twitter spam accounts.