Queen Elizabeth II's final journey begins: King Charles escorts mother's coffin

Britain's King Charles III (L), Britain's Princess Anne, Princess Royal (C), and Britain's Prince Andrew, Duke of York walk behind the procession of Queen Elizabeth II's coffin, from the Palace of Holyroodhouse to St Giles Cathedral, on the Royal Mile on September 12, 2022, where Queen Elizabeth II will lie at rest. 

The coffin of Britain's late Queen Elizabeth II, draped with the Royal Standard of Scotland, leaves the Palace of Holyroodhouse, in Edinburgh, on September 12, 2022

Members of the public gather to watch the procession of Queen Elizabeth II's coffin, from the Palace of Holyroodhouse to St Giles Cathedral, on the Royal Mile on September 12, 2022, where Queen Elizabeth II will lie at rest. 

Britain's King Charles III and Britain's Camilla, Queen Consort (unseen) are driven along the Royal Mile towards the Palace of Holyroodhouse, in Edinburgh on September 12, 2022. Mourners will on Monday get the first opportunity to pay respects before the coffin of Queen Elizabeth II, as it lies at rest in an Edinburgh cathedral where King Charles III will preside over a vigil.
 

Britain's Camilla, Queen Consort travels behind the procession of Queen Elizabeth II's coffin, from the Palace of Holyroodhouse to St Giles Cathedral, on the Royal Mile on September 12, 2022, where Queen Elizabeth II will lie at rest.

Britain's Prime Minister Liz Truss (R) arrives to attend a service of Thanksgiving for the life of Queen Elizabeth II, at St Giles' Cathedral, in Edinburgh, on September 12, 2022. 

A picture of Britain's Queen Elizabeth II is seen amonst floral tributes left in Green Park in London on September 12, 2022, as preparations for the funeral continue following the death of Queen Elizabeth II on September 8. The state funeral for Queen Elizabeth II will be held at Westminster Abbey in London at 11:00 am (1000 GMT) on Monday September 19.
 

Britain's King Charles III (L) is offered Keys of the City of Edinburgh by the Lord Provost Robert Aldridge during the Ceremony of the Keys the Palace of Holyroodhouse in Edinburgh on September 12, 2022. Mourners will on Monday get the first opportunity to pay respects before the coffin of Queen Elizabeth II, as it lies in an Edinburgh cathedral where King Charles III will preside over a vigil.
 

King Charles III, dressed in army uniform, and his siblings Princes Anne, Prince Andrew and Prince Edward walked behind the hearse as the procession moved slowly toward St. Giles’ Cathedral.
 

People arrive to attend a service of Thanksgiving for the life of Queen Elizabeth II, at St Giles' Cathedral, in Edinburgh, on September 12, 2022. Mourners will on September 12, 2022 get the first opportunity to pay respects before the coffin of Queen Elizabeth II, as it lies in an Edinburgh cathedral where King Charles III will preside over a vigil.