King Charles agreed that the Duke of Sussex's children should use their royal titles at the end of 2022, HELLO! can exclusively reveal.The decision that Prince Harry's children would be known as Prince Archie and Princess Lilibet of Sussex was settled between father and son the month before Prince Harry’s memoir Spare was published. Harry and Meghan’s children automatically became a Prince and Princess when their grandfather became King Charles III, but it was not known whether they would take the titles, amid reports that the monarch could issue letters patent to remove them.WATCH: Meghan Markle and Prince Harry hint that Lilibet has already been christenedAn intervention by the King could have ended the precedent of conferring the titles on male line grandchildren of the Sovereign.