Photo agency denies Duke and Duchess of Sussex were in danger 1:15

(CNN) -- The Duke of Sussex arrived at the High Court in London on Tuesday to testify in his lawsuit against Mirror Group Newspapers, whose newspapers he accuses of phone hacking and other illicit activities.

Harry arrived at the Rolls Building in central London at around 9:36 a.m. local time in a black Range Rover, dressed in a black suit.

He entered the building without answering questions from reporters before clearing security inside, according to news agency PA Media.

Harry's in-person appearance in court is extremely rare for a member of the British royal family. It is believed to be the first time a royal has appeared in person since 2002, when Princess Anne pleaded guilty after her dog bit two children in a Windsor park, according to news agency PA Media.

It has been more than 130 years since a senior member of the royal family testified in court, when Edward VII was a witness in a trial for slander over a card game in 1891, before becoming king, Reuters reported.

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It is not yet clear whether Harry's testimony will refer to other royals or his relationships with other family members. But his brother and heir to the throne, Prince William, has recently been implicated in another of Harry's cases.

It remains to be seen whether this week's case will raise questions for other members of the royal family. But it marks a turning point in Harry's efforts against major British media players, and his appearance is likely to dominate headlines in the coming days.

TrialNews from Prince Harry of the United Kingdom