Prince Philip, 99, was admitted the private King Edward VII Hospital in London on Tuesday evening, the palace said in a statement Wednesday.
It called the admission “a precautionary measure” taken on the advice of Philip’s doctor. The palace said Philip is expected to remain in the hospital for a few days of “observation and rest.”
Philip, also known as the Duke of Edinburgh, retired from public duties in 2017 and rarely appears in public.
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The Associated Press contributed to this report.