Prince Harry is going where other royals haven't in a century: the witness stand. Here's what to expect when he testifies in his phone-hacking suit.

Prince Harry was the target of illegal information-gathering even as a young schoolboy, his lawyer told a London court Monday in his case against a tabloid newspaper publisher.

Prince Harry will become the first British royal to appear in the witness box since the 1890s when he testifies this week at the High Court in London as part of his lawsuit against Mirror Group Newspapers.

If Harry testifies as scheduled Tuesday in his lawsuit against the publisher of the Daily Mirror, he'll be the first member of the royal family to do so since the late 19th century, when Queen Victoria's eldest son, Prince Albert Edward, testified twice in court.

Prince Harry is doing something British royals have rarely done before: He's going to court. The Duke of Sussex is set to testify this week in a phone-hacking trial against British tabloids.

LONDON—Prince Harry will become the first senior British royal to give evidence in court for more than a century when