Prince Philip, Queen Elizabeth's husband, was hospitalized in London early Friday, according to Buckingham Palace. The Duke of Edinburgh is 98 years old, and was staying at the Queen's Sandringham estate when he was taken to Edward VII Hospital.
"The Duke of Edinburgh traveled from Norfolk this morning to King Edward VII Hospital in London for observation and treatment in relation to a pre-existing condition," the palace said in a statement to the BBC. "Admission is a precautionary measure, on the advice of your Royal Highness doctor."
Prince Phillip was not taken to the hospital by ambulance. Instead, this was a planned admission, and is expected to stay for a few days.
After retiring from public life in August 2017, Prince Felipe has maintained a relatively low profile and is rarely seen in public. The last time they saw him was in May when he attended Lady Gabriella Kingston's wedding.
The Duke of Edinburgh has also had numerous health problems in recent years, and royalty has been entering and leaving the hospital without missing the scheduled appearances. In 2011, Prince Felipe underwent emergency surgery to correct a blocked artery, and in 2012 he suffered a bladder infection.
Last year he canceled his appearance at Maundy's religious service at the last minute, and also skipped Easter Sunday services.
Prince Philip has been married to Queen Elizabeth for 72 years. When the monarch was crowned Queen in 1952, he became the consort, and has been the oldest consort of a reigning sovereign in British history, according to We weekly.
Queen Elizabeth and Prince Philip are parents of four: Prince Charles, Princess Anne, Prince Andrew and Prince Edward, and they also have eight grandchildren and eight great-grandchildren.
When they celebrated their 50th wedding anniversary in 1997, Queen Elizabeth said Prince Philip was someone who doesn't like compliments easily. But he had to let the world know that the Duke of Edinburgh has been his "strength and permanence for all these years."
"I, and all his family, and this and many other countries, owe him a greater debt than he would ever claim, or we will ever know," said the Queen.
Queen Elizabeth arrived at her private residence in Sandringham on Friday for the annual family Christmas celebration. The palace has not revealed whether Prince Felipe will leave the hospital in time for the celebration of family parties.