Her Majesty announced death of her husband of 73 years at midday Today and joins 'the world in mourning'
Philip was in Windsor after being treated for an infection and pre-existing heart condition for 28 nights
Duke of Edinburgh had kept a low profile since conducting his final solo public engagement in August 2017
After retiring, Philip spent much of his time at Windsor and at Queen's private Sandringham estate in Norfolk
Duke was the longest-serving consort in British history and the oldest serving partner of a reigning monarch