The Duke of Sussex will appear at the High Court in London this week in his civil trial against Mirror Group Newspapers.
He's suing Mirror Group Newspapers over allegations of phone hacking and illegal information gathering between 1996 to 2010 for 33 articles.
Prince Harry seeks to prove that stories were written about him using illegally obtained information.
The Duke of Sussex is one of a number of high-profile figures bringing a case and is due in the witness box tomorrow.
He will be the first member of the British Royal Family to appear to give evidence in court since the 19th century.
“This is a far cry from the adage to never explain [and] never complain,” Professor Anna Whitelock said. “Although it will be box-office, it’s for precisely that reason that the Royal Family in the police will be somewhat anxious.”
Media law expert David Banks said this is a “historic” moment for the British Royal Family.
“The Royal Family have studiously avoided being involved in anything remotely like this,” he said. “Now we've got the prospect of a royal prince in the witness box for some considerable time going over the most personal stuff.”
Prince Harry will have to prove he had no previous knowledge of phone-hacking from Mirror Group Newspaper before at least 2014.
“There's a fairly strict limitation period – normally, you need to bring a claim like this within six years of your knowledge of events,” lawyer Antonia Foster said.
“What is currently up debate is what he knew and when and whether information that he says he got at a later stage, he could have known earlier.”
"He wants to embarrass"
Some claim the lawsuit is less about Prince Harry seeking retribution than embarrassing public figures.
“Win or lose, he wants to embarrass both the media and certain members of the royal family and the royal household,” former Sunday Mirror Editor Paul Connew said.
“This for him is a crusade, as he sees it. Others think of it as a morbid obsession.”
Mr Connew edited the Sunday Mirror briefly in 1994.