He may be gearing up to be crowned in one of the most historic events that will be watched by the eyes of the world. - but to his five grandchildren, King Charles is simply grandad.
The monarch has spoken of his pride in his youngest relatives, however, despite his clear love for each and every one of his five grandkids, it appears that his bond with each of them differs greatly.
Of course, he sees more of Prince George, Princess Charlotte and Prince Louis, who all live in the UK with their parents the Prince and Princess of Wales, who are close to the King.
While Prince Archie and Princess Lilibet, who live in California, have less opportunity to bond with their grandfather, who has had a somewhat frosty relationship with their parents, his youngest son Prince Harry and daughter-in-law Meghan Markle.
And here we look at Charles' bond with all of the youngsters...
Prince George
No doubt holding a special place in Charles' heart is nine-year-old Prince George, the oldest of his grandchildren.
When George was born in July 2013, the King spoke of how he was "overjoyed" to have become a grandfather.
He explained: "Grandparenthood is a unique moment in anyone's life, as countless kind people have told me in recent months, so I am enormously proud and happy to be a grandfather for the first time."
And in a tribute to his eldest grandson, at the time of his birth, Charles built an arboretum and planted trees at Balmoral in his name, calling it Prince George's Wood.
He told the BBC in 2021: "The great thing was that I managed to plant it the same year that my grandson was born, the eldest, George, so I thought I'd call it Prince George's wood."
However, in 2015, it was reported by the Daily Mail that Charles had become "increasingly perplexed" about the peripheral role he felt he played in the life of George.
And several years later, William spoke in a documentary to mark his father's 70th birthday, where he revealed his wish for his children to spend more time with their granddad.
He said: "I would like him to have more time with the children… to, you know, play around with the grandchildren.
"When he's there, he's brilliant, but we need him there as much as possible.”
But the Princess of Wales helped smooth relations when she is said to have persuaded Charles to visit their Norfolk home Amner Hall in the summer of 2020 and took on the logistical challenge of getting her family back home from a holiday on the Isles of Scilly to coincide with his visit.
In doing so, it was reported that the heir to the throne was able to give his grandson George a seventh birthday present in person.
Now ahead of his Coronation in a few weeks, Charles' has handed George a plum role in the ceremony - he will be one of his pages of honour.
George and seven other boys named Pages of Honour will “attend their majesties”, the King and Queen, during the service.
They are primarily responsible for carrying their long, heavy robes. The honour is usually granted to teenage sons of members of the nobility and gentry, and especially of senior Royal Household members.
Princess Charlotte
Second oldest grandchild and his first granddaughter, Princess Charlotte, whose name pays a direct tribute to her grandfather, with Charlotte the feminine version of the name Charles.
In May 2015, Charles, who was then Prince of Wales, was on a visit to his model town, Poundbury, in Dorset a few days after Charlotte's birth.
He told well-wishers he had been really hoping for a girl and described her as "beautiful".
And he added: "I am thrilled. I was hoping for a granddaughter – someone to look after me when I am very old."
Now, it seems Charlotte has firmly been in Charles' plans for the future, according to a new book, after he is claimed to have reserved one of the "grandest" royal titles
Royal author Robert Jobson writes in his new book Our King Charles III: the Man and the Monarch that Charlotte is in line to become the future Duchess of Edinburgh..
He explains: "Sensitive to the fact that nine-year-old Prince George's future is already mapped out, Charles has been careful to reserve one of the grandest titles for Princess Charlotte – currently called Lottie by her mother and Mignonette (French for cute little thing) by her father."
"Although the King has made his brother Edward the new Duke of Edinburgh, the title is only for life. After Edward dies, Charles has made it clear Charlotte (now aged seven) should become Duchess of Edinburgh."
Prince Louis
The third of his five grandchildren, Prince Louis, who turns five on Sunday, clearly has a special bond with his grandad the King.
The first glimpse of their close relationship came in 2020 on Louis' second birthday when Charles marked the day by releasing a touching photo of him hugging his the then-toddler.
But it was at the Queen's Platinum Jubilee celebrations when the heartwarming grandad-grandson relationship was clear to see.
As the royals all watched the Jubilee Pageant at Buckingham Palace, a restless Louis asked to sit on his grandpa's knee and sweet pictures show the youngster being bounced up and down by the now-King.
One royal fan tweeted: "Prince Charles and Prince Louis have the best bond."
"Lovely to see Prince Charles in grandpa mode with Prince Louis today!," wrote another.
Prince Archie
The King's youngest grandson is Prince Archie with Charles saying he "couldn't be more delighted" when he was born in May 2019.
Archie is the son of Charles' youngest child Harry and his wife Meghan and when he was christened, the King's former Clarence House Instagram account shared a touching photo of Charles proudly gazing at Archie.
However, as Harry and Meghan decided to quit as working royals and up sticks from the UK and move to the United States, the King has spent little time with his young grandson.
Their last meeting was last year, when Archie came to the UK with his parents during the Queen's Platinum Jubilee celebrations.
But when it is the Coronation in a couple of weeks, Archie will not be there, as he will be staying behind in California with mum Meghan.
On the day of the Coronation, he turns four, and a source told The Sun: "It is sad, he is very disappointed that he won’t see Meghan or his grandchildren but understands the situation."
However, Charles was said to be open to the suggestion that he should make a gracious nod to his grandson by raising a glass at a post-procession Coronation lunch.
However, it's been claimed this is no longer being considered as neither of the Sussexes will be attending.
Harry is set to rush straight off after the ceremony to get back to celebrate with his son, while Meghan has decided to avoid the Coronation altogether.
A source told the Mail on Sunday: "The King considered a toast to Archie. But with no member of the Sussex family now due at the lunch, it is highly unlikely he would do in their absence."
Princess Lilibet
The grandchild that Charles has seemingly spent the least amount of time with is his youngest Princess Lilibet.
In fact, it appears they have only met the once - when she came to the UK with her parents and brother Archie last year.
At that point, she was rapidly approaching her first birthday and it was her first visit to the country, having been born in California.
And speaking about this meeting, a source said: "The prince, of course, hasn’t seen his grandson Archie for a bit of time and so it was very, very, very special to have some time with him.
"He hadn’t met Lili, his granddaughter, and so to meet her was very emotional, a very, very wonderful thing."
Unfortunately, Charles did not attend Lilibet's christening earlier this year as it took place at Harry and Meghan's home in California.
However, it did emerge that both Lilibet and Archie would now be known as Princess and Prince - titles they are now entitled to given their grandfather is King.
