Prince Harry made a rare public appearance in Britain at London's Royal Courts of Justice to fight the government over changes made to his security after he stepped down from royal duties, which his lawyer branded unjustified.
Prince Harry, King Charles' younger son, is trying to overturn a decision by the Home Office - the ministry responsible for policing - which decided in February 2020 that he would not automatically receive personal police security while in Britain.
Last year, the High Court in London ruled that decision was lawful and refused him permission to challenge that ruling in a higher court. However, the Court of Appeal agreed to hear the case following a direct application from Prince Harry's lawyers.
Prince Harry, arrived smiling and waving for the two-day hearing in front of three senior appeal court judges and listened intently as the case got underway in a packed courtroom, occasionally scribbling messages to his legal team.
Prince Harry's lawyer Shaheed Fatima said the agency which protects royal and public figures had treated Prince Harry on a "bespoke" basis not applied to anyone else.
"It means he has been singled out for different, unjustified and inferior treatment," she said, saying he was not seeking to be treated as he was when a working member of the royal family.
In written submissions, Prince Harry's lawyers said al-Qaeda had recently called for him to be murdered, and he and wife Meghan Markle had been involved in "a dangerous car pursuit with paparazzi in New York City" in 2023.
According to the Sun newspaper, Prince Harry, 40, flew in from his home in California yesterday, but it was not clear if he would be seeing any of his family from whom he has become estranged since his public criticism of his relatives and royal aides.
King Charles and Prince Harry's stepmother Queen Camilla are currently on a state visit to Italy where they will be celebrating their 20th wedding anniversary.
Prince Harry's trip also comes amid a high-profile, bitter dispute with the chief executive of his charity Sentebale, which he founded in honour of his late mother, Princess Diana.
Sophie Chandauka has accused him of bullying and racism, while Prince Harry, who stepped down from his role at the charity, has called what happened "heartbreaking".
Evidence in private
At the outset of today's hearing, Geoffrey Vos, the Master of the Rolls and the second most senior judge in England and Wales said some of the evidence could not be given in public, but he wanted as much as possible heard openly.
Prince Harry, along with other senior royals, had received full publicly funded security protection before he stepped back from his royal duties and moved to the US with Ms Markle in March 2020.
The Executive Committee for the Protection of Royalty and Public Figures, then decided Harry would no longer receive the same level of state-funded protection.
In its submission to the court, the government said his security would be based on the circumstances, stating that the prince's appeal amounted to "a continued failure to see the wood for the trees".
Bare disagreement with the decision and the judgment - which is the essence of the prince's complaint - does not amount to a ground of appeal, the submission said.
Prince Harry's case against the government is one of a number of legal forays he has made in recent years, having taken action against a number of British newspapers over invasions of privacy and phone hacking.