Prince Philip, 99, the husband of the UK's Queen Elizabeth II, left hospital in London on Tuesday a month after his admission for an infection and subsequent heart surgery. 

The prince, who also holds the title of Duke of Edinburgh, returned to Windsor Castle in Berkshire, where he will recuperate with the Queen. 

Their eldest son and heir to the throne, Prince Charles, said he was "delighted" that his father was in recovery, during a visit to a vaccination center in the Finsbury Park Mosque in London.

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Prince Philip, who will celebrate his 100th birthday in June, was admitted to the King Edward VII private hospital on February 16. He returned there after having "successfully" undergone an operation for a pre-existing heart problem in another establishment in March at St. Bartholomew's Hospital. 

He was hospitalized in February as a "precaution" after feeling ill. Buckingham Palace said a few days later that this hospitalization was due to an infection.

Having participated in more than 22,000 official public engagements since the Queen's accession to the throne in 1952, Prince Philip retired in August 2017. 

He had already been hospitalized several times since 2017, most recently in December 2019 for "pre-existing health problems." He was also in a car accident in January of the same year when his Land Rover crashed into another vehicle coming out of a driveway in Sandringham Estate, Norfolk. He gave up driving following this incident.