The Duke of Edinburgh has been taken to hospital after suffering chest pains, Buckingham Palace has said.
Prince Philip was treated for a blocked coronary artery and a successful "invasive procedure of coronary stenting" was performed.
The duke, aged 90, had been taken from Sandringham to the cardiothoracic unit at Papworth Hospital in Cambridgeshire.
The Royal Family had been gathering at Sandringham, a traditional royal retreat in Norfolk, for Christmas.
The couple were formally wed on Friday in a civil service and said "I do" for a second time on Saturday in front of 800 royal and celebrity guests in a lavish ceremony rounded off by fireworks and a ball for 200 friends.A wedding brunch followed yesterday in the private gardens of the tiny principality's royal palace, prepared by French chef and creator of the main wedding feast.