The Duke of Edinburgh, as he was officially known, had spent four weeks in a UK hospital earlier this year to receive treatment for an infection and have a heart procedure, but returned to Windsor in early March.
He had been by the queen’s side throughout her 69-year reign, the longest in British history.
“He has, quite simply, been my strength and stay all these years,” the queen said in a rare personal tribute to him made in a speech marking the pair’s 50th wedding anniversary in 1997.
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