Britain's 99-year-old Prince Philip has been admitted to a London hospital after feeling unwell, Buckingham Palace said Wednesday.
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The palace said the husband of Queen Elizabeth II was admitted to the private King Edward VII Hospital on Tuesday evening.
It called the admission "a precautionary measure" taken on the advice of Philip's doctor. The palace said Philip, also known as the Duke of Edinburgh, is expected to remain for a few days of "observation and rest."
His illness is not believed to be related to COVID-19. The queen and Philip received the first dose of a vaccine against the coronavirus in early January.
Philip retired from public duties in 2017 and rarely appears in public. His most recent public event was a military ceremony at Buckingham Palace in July.