Prince Philip, Queen Elizabeth's husband, had a "good night" after undergoing heart surgery Friday, the same day as being taken to hospital with chest pains.
The BBC, citing Buckingham Palace, reported that:
Prince Philip was treated for a blocked coronary artery and a successful "invasive procedure of coronary stenting" was performed.
He was reportedly taken to the cardiothoracic unit at Papworth Hospital in Cambridge, where the "minimally invasive procedure" of stenting — which according to the BBC involves "pushing a balloon into the artery and blowing it up to remove the blockage" — was performed.
"The Duke of Edinburgh had a good night," a Buckingham Palace spokesperson told the Daily Telegraph.
Queen Elizabeth visited him in hospital Saturday, Christmas Eve day, accompanied by their son, Prince Edward.
Prince Philip, whose formal title is the Duke of Edinburgh, developed pains at Sandringham, in Norfolk, the private home of four generations of British monarchs, according to CNN, and the place where the Royal Family traditionally celebrates Christmas.
The BBC cites Royal commentator Margaret Holder as saying the health scare might not be as serious as it sounded, and that the long flights involved with a recent visit to Australia may have simply "taken something out of him."
"He is 90, he has been in remarkable health. For somebody who has just done an 11-day tour of Australia at 90, that's amazing in itself as it is."
Queen Elizabeth and Prince Philip married Nov. 20, 1947, in London’s Westminster Abbey, making him the "longest-serving consort in British history," according to the BBC.
The couple have three other children, Anne, Andrew and Edward, and their eldest son, Charles, father to princes William and Harry, is next in line to the throne.
The queen, who is 85, will celebrate her 60th year on the British throne in 2012, according to Bloomberg, adding that the royal couple is due to tour the UK.
The duke, who turned 90 in June, reportedly said in a recent interview with the BBC, that he would gradually "wind down" his workload.
"I reckon I've done my bit, I want to enjoy myself now ... have less responsibility, less frantic rushing about, less preparation, less trying to think of something to say," he reportedly said.