When Prince Harry, the Duke of Sussex, made an unexpected appearance at the high court on Monday, it marked the highest-ranking royal in a courtroom since Princess Anne. Harry is accusing Associated Newspapers, the parent company of the Daily Mail, of being out of control.

In a witness statement, Harry claimed that the company's newspapers feigned being a "beacon of truth and integrity," while actually engaging in "illegal or unlawful information-gathering activities." He added that he's pursuing the case because he loves his country and is deeply concerned about Associated Newspapers' unchecked power, influence, and criminality.

Associated Newspapers has dismissed the allegations as "preposterous smears" and highlighted that Harry and his co-claimants are relying on testimony from a private investigator who has since retracted his statement.

The legal battle has garnered global media attention, with Harry's decision to fly in from the US and enter the court through the front door for maximum exposure. The hearing, a series of technical legal applications by Associated Newspapers, seeks to prevent the claims from going to trial.

Both sides have much at stake. The newspaper group hopes to kill the case early and discredit the material behind Harry's allegations. Meanwhile, Harry and his fellow claimants want Mr. Justice Nicklin to allow the case to go to trial, where their allegations can be tested in open court with significant publicity.

As the hearing progressed, Elton John, David Furnish, Sadie Frost, and Doreen Lawrence joined Harry in the courtroom. Barrister David Sherborne, representing Prince Harry and other prominent individuals, argued that his clients had "compelling" new evidence of wrongdoing. Associated Newspapers countered, calling the claims "appalling and utterly groundless."

The outcome now lies in the hands of Mr. Justice Nicklin, who will decide in the coming weeks whether the case can proceed to trial, potentially resulting in one of the most high-profile media trials in British legal history.