London (CNN) — Britain’s Prince Harry has arrived at the High Court in London to attend a hearing in his lawsuit against Associated Newspapers Limited for allegedly illegal information gathering.

The Duke of Sussex joined a group of high-profile figures, including singer Elton John, last year in legal action against the editor of the Daily Mail, Mail on Sunday and Mail Online.

The lawsuit accuses Associated Newspapers Limited (ANL) of using various criminal means to obtain information about personalities over the years.

Elizabeth Hurley, Sadie Frost, David Furnish and Doreen Lawrence make up the rest of the plaintiffs in the legal action.

They claim to have been “victims of heinous criminal activities and serious violations of privacy”, according to a statement from their representatives at the time.

The group accused the ANL of hiring private investigators to carry out illegal acts, such as placing listening devices in homes and cars and recording private phone calls. He also claims that the publisher would pay corrupt police officers to obtain insider information, engage in impersonation and fraud to obtain medical records, and hack into bank accounts and financial transactions by “illegal means and manipulation”.

A four-day preliminary hearing begins on Monday at the Royal Courts of Justice in London, during which the ANL is expected to try to dismiss the case.

Elton John arrives in his role as a plaintiff at the Royal Courts of Justice followed by his husband David Furnish (behind left) on March 27, 2023 in London, England. (Photo by Dan Kitwood/Getty Images)

The publisher dismissed the allegations as “absurd libel” and dismissed the lawsuit as a “planned and pre-orchestrated attempt to drag Mail titles into the wiretapping scandal”, according to PA Media.

An ANL spokesman added that the allegations were “baseless and highly defamatory claims based on no credible evidence”, reports UK news agency PA Media.

The lawsuit against the ANL is one of several filed by Prince Harry in recent years.

He also sued the ANL after the Mail on Sunday newspaper published an article about his legal proceedings against the British Home Office over his family’s security measures during their visit to Britain.

Meanwhile, he also sued the owners of British tabloids The Sun and Daily Mirror in 2019 for alleged historical phone hacking. The case against the Daily Mirror editor is due to go to trial in May.

The 38-year-old prince’s surprise appearance in London on Monday is believed to be his first trip back to the UK since he and his wife, Meghan, attended the late Queen Elizabeth II’s funeral in September.

Over the next few months, the Sussexes released a Netflix documentary series and The Duke’s Memoirs, which provided further insight into his fractured relationship with the rest of the royal family.

Harry is not expected to see his brother, the Prince of Wales, a royal source told CNN. As it is the school holidays, Prince William is not in Windsor, the source added.