Queen Elizabeth IIs husband Prince Philip, was today admitted to a London hospital for a planned hip surgery, Buckingham Palace said.
The duke was not at last Thursday's Royal Maundy Service at Leicester Cathedral, with his absence said to be because of a hip problem.
The 96-year-old prince has largely retired from public life, but still accompanies Queen Elizabeth II on occasion.
At a ceremony commemorating Britain's war dead in November, he appeared to be having trouble standing and leaned against a wall.
Philip also missed an engagement on March 22 because of his hip.
It was founded in 1899 at the suggestion of the then-Prince of Wales, and has treated most senior members of the royal family, including the Queen, Prince of Wales and the Duke of Cambridge.
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Prince Philip had announced his retirement from all public duties as the Duke of Edinburgh in May, 2017 owing to his age.
His last solo appearance was seen in August 2017, when he reviewed the Royal Marines outside Buckingham Palace.
Officially, Queen Elizabeth has supported Prince Philip's decision to retire.
Last June, he spent two days in hospital as a precautionary measure for an infection. The royal couple has been married for 70 years.
His surgery comes ahead of a busy time for the royal family, with Kate Middleton, Duchess of Cambridge, due to give birth to her third child some time this month, and the wedding of his grandson, Prince Harry, with Meghan Markle on May 19.