Prince Philip, 99, leaves hospital after four weeks

Philip, the Duke of Edinburgh, was admitted to the private King Edward VII's Hospital on Feb. 16 after he felt unwell and was given treatment for an unspecified, but not COVID-19-related, illness.

He was transferred briefly at the start of this month to a specialist cardiac centre at another London hospital, where he underwent a successful procedure for a pre-existing heart condition.

"His Royal Highness wishes to thank all the medical staff who looked after him at both King Edward VII's Hospital and St Bartholomew's Hospital, and everyone who has sent their good wishes," Buckingham Palace said in a statement.

A royal source said the prince was in good spirits.

He has been returned to Windsor Castle, the royal residence west of London, waving to those outside as he arrived.