Prince Philip, husband of Queen Elizabeth and a leading figure in the British royal family for almost seven decades, has died aged 99, Buckingham Palace said on Friday.

The Duke of Edinburgh, as he was officially known, had been by his wife’s side throughout her 69-year reign, the longest in British history, during which time he earned a reputation for a tough, no-nonsense attitude and a propensity for occasional gaffes.

“It is with deep sorrow that Her Majesty The Queen...