Why is Prince Harry heading to the High Court?
Prince Harry is one of four people claiming Mirror Group newspapers hacked their voicemails. It is one of several cases the Duke of Sussex is currently involved in with British tabloids.
He is the first royal of modern times to give evidence and be cross-examined in a British court.
The BBC's media editor Katie Razzall explains.
You can read more from our Royal correspondent Sean Coughlan here.