King Charles III’s youngest son, Harry, claims private investigators working for two tabloids owned by Rupert Murdoch’s News Group Newspapers, NGN, repeatedly targeted him unlawfully more than a decade ago.

It is one of several lawsuits the 40-year-old has pursued against UK newspaper publishers, with the California-based royal winning a phone hacking case against Mirror Group Newspapers, MGN, just over a year ago.

The High Court’s claim against NGN does not encompass phone hacking allegations after judge Timothy Fancourt previously ruled the prince had run out of legal time to pursue that claim.

The only remaining claimant in the case is Tom Watson, a former deputy leader of the ruling Labour Party who now sits in the House of Lords.

The pair accuse The Sun and now-shuttered News of the World of using unlawful newsgathering techniques to generate stories about them more than a decade ago, adding  that NGN executives deliberately covered up their practices by deleting emails.

Watson also alleges his phone was hacked between 2009 and 2011 when he was investigating Murdoch’s tabloids as a member of parliament on a watchdog committee.