Prince Harry, the Duke of Sussex, accuses Associated Newspapers of hiring private investigators to bug cars and eavesdrop on him in landmark legal battle.

Prince Harry, the younger son of King Charles III, will take the stand Wednesday in a London courtroom. Harry is scheduled to testify in the privacy invasion case against publisher Associated Newspapers Limited, the publishers of the Daily Mail and Mail on Sunday. He is the first witness to be called in the trial, which began Monday.

The Duke of Sussex’s legal team says alleged unlawful reporting had a “profoundly distressing effect” on Harry

The Duke of Sussex arrived at London's High Court on Monday “confident and ready,” a spokesperson told NBC News ahead of his battle with the publisher of the Daily Mail.

LONDON -- Millions of dollars are on the line as Prince Harry returned to court on Monday for the third and final chapter in his legal quest to tame the British tabloids.

Kate Middleton and Prince William are having an away day in Scotland.

Royal experts reveal the condition for Meghan Markle's U.K. return as Prince Harry prepares for Birmingham trip in July. Security concerns dominate talks.