The King met a young “queen” as he arrived for his first public engagement north of the border since his coronation.
The monarch was welcomed by crowds as he arrived at Kinneil House in Bo’ness, Falkirk – the historic home of the dukes of Hamilton – wearing a kilt.
Among those the King greeted was Lexi Scotland, who was recently “crowned” queen of the Bo’ness Fair, an annual community event for children in the town.
The youngster looked the part as she met the King. She was wearing her ceremonial robes and a crown.
During his visit, the King also viewed the cylinder of an engine erected by the famed Scottish engineer, James Watt.
The house, along with the nearby James Watt Cottage, were the settings for the engineer’s secret development work on the prototype steam engine in 1765-73.
The King also planted a tree to commemorate the centenary of the estate becoming a public park and met charity representatives and beneficiaries.
The visit is the first of a series of engagements in Scotland, marking the first Holyrood Week since his coronation.
There will be a special ceremony of thanksgiving at St Giles’ Cathedral in Edinburgh on Wednesday, where the King will be presented with the Honours of Scotland – the nation’s crown jewels.
Each year, the monarch traditionally spends a week based at the Palace of Holyroodhouse in Edinburgh, known as Holyrood Week or Royal Week in Scotland.
The King and Queen will be accompanied by William and Kate, whose Scottish titles are the Duke and Duchess of Rothesay.
Later on Monday, the King will take part in the Ceremony of the Keys on the palace forecourt where he is presented with the keys to the city.
The King and Queen Camilla are also expected to visit the Great Tapestry of Scotland, seeing a newly stitched panel dedicated to the couple.
Wednesday will be a key day during the visit with a series of events to mark the coronation.
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Before the service at St Giles, there will be both a Royal Procession and a People’s Procession along the Royal Mile.
Anti-monarchy campaign group Republic will be staging a protest along the route and said it expects a large turnout.
The organisation will also be collaborating with the Scottish republican group Our Republic, which will be staging a rally outside the Scottish Parliament.
Graham Smith, Republic’s chief executive officer, said: “Everyone in the UK should have the right to choose our head of state – not be told it will be Charles.
“Charles does not represent the people of Scotland any more than he represents the rest of the UK.”
The People’s Procession will consist of about 100 people representing different aspects of Scottish life.
At the head of the column will be the Shetland pony Corporal Cruachan IV – the mascot of the Royal Regiment of Scotland.
The Stone of Destiny will be present at the ceremony in St Giles’ Cathedral, where the King will be presented with the Honours of Scotland.
Afterwards, there will be a gun salute at Edinburgh Castle and a flypast by the Red Arrows.
Edinburgh City Council has said those wishing to view the processions should plan ahead.
Lord Lieutenant Robert Aldridge said: “The eyes of the world will be upon us once again as we mark the coronation of his majesty, King Charles III, and her majesty, Queen Camilla.
“I’m quite sure it will be another proud day for the capital.
“Given the scale and significance of these ceremonial events, we have to be prepared for disruption across the city but, particularly, in the Old Town.
“We’re working with our partners to manage this as best we can and to keep residents, businesses and visitors updated on the events.
“For those who wish to enjoy the royal and people’s processions, I urge you to please plan ahead and keep an eye on our website and social media channels for the latest advice and guidance.”