Prince Philip left a London hospital on Tuesday after being treated for an infection and undergoing a heart procedure over the past month. He has since arrived at Windsor Castle.

Philip, 99, the husband of Queen Elizabeth II, had been hospitalized since being admitted to the private King Edward VII’s Hospital in London on February 16th, where he was treated for an infection.

He was later transferred to a specialized cardiac care hospital, St. Bartholomew’s, for a short stay, before returning to King Edward VII’s.

(Britain’s Prince Philip, Duke of Edinburgh leaves King Edward VII’s Hospital in central London on Tuesday.Daniel Leal-Olivas / AFP – Getty Images)

Photographers standing outside the door of the private hospital captured his departure by car.

“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.

Philip’s illness is not believed to be related to COVID-19.

Both Philip and Elizabeth received COVID-19 vaccinations in January and chose to publicize the matter to encourage others to also take the vaccine.

The longest-serving royal consort in British history, Philip married the then-Princess Elizabeth in 1947. He and the Queen have four children, eight grandchildren and nine great-grandchildren.