THE HAGUE, Netherlands (AP) — The heir to the Dutch throne, Princess Amalia, was recovering in a hospital Wednesday after undergoing surgery to one of her arms that she broke a day earlier when she fell off her horse, the Royal House announced. The 21-year-old, formally known as the Princess of Orange, sustained the injury on Tuesday and underwent surgery the same evening at the University Medical Center Utrecht hospital, according to a Royal House statement. “The operation went well.