Prince Philip, 96, the husband of Britain's Queen Elizabeth II, has been treated in hospital for an infection linked to a pre-existing condition, Buckingham Palace said on Wednesday.
"The Duke of Edinburgh was admitted to King Edward VII Hospital in London last night, as a precautionary measure, for treatment of an infection arising from a pre-existing condition," the palace said in a statement.
"Prince Philip is in good spirits and is disappointed to be missing the state opening of parliament and Royal Ascot," it said, referring to a horse-racing event in Ascot, southern England.
It said the queen would attend Royal Ascot as planned later Wednesday after delivering her speech to the opening of parliament.
Prince Philip announced in April that he had decided not to carry out any more public duties after August.
