The United Kingdom fell silent for a minute of reflection ahead of Prince Philip's funeral on Saturday afternoon.
The King's Troop Royal Horse Artillery fired a gunshot to signal the start of the silence at St George's Chapel, Windsor Castle, at 3:00pm.
Members of the royal family fell silent and people across the country - including Prime Minister Boris Johnson - did the same.
There were gun salutes by royal regiments at sites including at Hillsborough Castle in Northern Ireland, Cardiff Castle in Wales, Edinburgh Castle in Scotland, and Royal Navy ships in Portsmouth, Devonport, and overseas.
Hundreds of people also fell silent outside the gates of Windsor Castle and outside Buckingham Palace in London.
Johnson observed the silence while watching the funeral on television from his country residence in Chequers, unable to be at the funeral because coronavirus restrictions limited the number of attendees to just 30 people.
Northern Ireland First Minister Arlene Foster observed the silence from Enniskillen Castle in County Fermanagh, while her Scottish counterpart Nicola Sturgeon paused on the steps of Bute House in Edinburgh.
Welsh First Minister Mark Drakeford, who sent a flower wreath to the duke's funeral on behalf of the people of Wales, also marked the silence.
Pupils at Gordonstoun School in northern Scotland also fell silent, standing on the south lawn in memory of the school's most famous former pupil.
The prince arrived at the school in 1934 as a 13-year-old, going on to spend five years there as a boarder.
The school bell tolled to mark the start of a minute's silence and a piper marked its end: standing on the roof by the school's flag at half mast, 17-year-old student John Prendergast played Flowers Of The Forest.
Earlier, he had played the same tune on Hopeman Harbour wall, as pupils laid a wreath in the Moray Firth, where the Duke of Edinburgh learned to sail as teenager.
At Hillsborough Castle in Northern Ireland, two rounds were fired marking the beginning and end of the silence.
Castle staff tweeted a photo of flowers beneath a tree planted by Prince Philip in 1949 during the first of his many visits to the site.
