Thailand's Crown Prince Vajiralongkorn has asked the government to strip his wife's family of their royally bestowed name.
It comes after seven of her close relatives were arrested in a purge of officials allegedly involved in corruption.
Princess Srirasmi Akrapongpreecha is Crown Prince Vajiralongkorn's third wife, and the pair married in 2001.
The move is widely expected to be a first step to divorce.
He was already known to be estranged from the princess, although they continued to attend official functions together.