King Charles III faces the challenge of a lifetime as he takes the throne amid several looming threats to the monarchy.
The main problems involve his nearest and dearest, such as the scandal surrounding his disgraced brother Prince Andrew and the ongoing rift between his sons Harry and William.
However, Charles must also deal with issues further afield as several Commonwealth countries seek to dump the monarchy following Queen's death.
The UK's cost of living crisis poses yet another challenge, with lavish royal spending threatening to alienate Brits struggling to make ends meet.
Here are the main challenges His Majesty faces as his reign begins.
Countries looking to break away from monarchy
His Majesty has become the head of state of 14 Commonwealth countries and the UK following his accession.
However, some of these Commonwealth nations have expressed a desire to ditch the monarchy in the future.
The Queen was respected across Britain's former colonies, however King Charles does not wield the same widespread admiration.
Barbados, which once known as 'little England', finally cut ties with the Queen last year.
Other Caribbean countries, including Jamaica and Antigua and Barbuda, are also preparing to remove the monarch as head of state.
Antigua and Barbuda's Prime minister Gaston Browne said he would push for a referendum on the monarchy following the Queen's death.
Belize has already confirmed a constitutional review.
New Zealand's PM Jacinda Ardern also said she believes her country will become a republic within her lifetime.
However, she added that there were no plans to remove the monarchy "any time soon".
What to do about Andrew
Prince Andrew has become a thorn in the side of the royal family.
The Duke of York agreed a £12million out of court settlement with Jeffrey Epstein's teenage sex slave Virginia Giuffre earlier this year.
Ms Giuffre had filed a civil lawsuit against Andrew, claiming he sexually abused her on three separate occasions, although the royal has always fiercely denied the claims.
He did not admit liability as part of the settlement.
The Queen's son was stripped of his titles and stepped back from royal life after a car crash interview with Newsnight in 2019.
But he was back in the public eye in recent days as he attended events linked to his mother's funeral.
Yesterday a protester shouted "Andrew, you're a sick old man" as the Duke of York followed his mother's coffin through Edinburgh's Royal Mile. A 22-year-old man was arrested and later charged with breaching the peace.
Controversially, it is understood the Duke of York will be allowed to wear his military uniform for his mother's final vigil in Westminster Hall.
It comes after Prince Harry was reportedly stripped of the right to wear his uniform at the same event.
As king, Charles will be forced to juggle the scandal with Andrew's apparent desire to remain in public view.
Reuniting his warring family
The rift between Charles' sons Harry and William threatens to cause some serious issues for the monarchy in the future.
Although the brothers have put on a united front in the aftermath of the Queen's death, their relationship is still strained.
Prince William was said to be furious with Harry over his and Meghan Markle's bombshell interview with Oprah Winfrey.
Meghan alleged that a member of the royal family had asked how dark her and Harry's first child Archie’s skin would be before he was born.
However, Harry and William's rift started long before the Oprah interview and even predates Megxit.
It reportedly started when William cautioned his brother over the speed with which he rushed into marriage with Meghan.
The clash between the brothers is now threatening to cause further problems for Charles as the new monarch.
Harry is set to publish a tell-all memoir later this year or early next year.
A royal insider previously said there was a “tsunami of fear” inside Buckingham Palace about the contents of the book.
Keeping the monarchy relevant in 21st century
Charles must modernise the monarchy if he wishes to keep it relevant in the 21st century.
The King has already shown signs of moving away with the more traditional aspects of monarchy with his walkabouts in the aftermath of his mother's death.
His Majesty greeted crowds of well-wishers outside Buckingham Palace, with one woman kissing the King on the cheek, while another pecked his hand.
One of the new monarch's allies previously said he had "lived through the decline of deference" and would display his "humanity and humour" as King.
Charles will also make the monarchy a leaner institution, cutting down the number of senior royals.
It comes after taxpayers were outraged over having to fork out for security guards for the so-called "pampered princesses" Beatrice and Eugenie.
In 2011, Charles ordered that the pair lose their taxpayer-funded police protection in a move that was said to have left their father Prince Andrew "furious".
Living up to his mother's enormous legacy
Charles has a hard act to follow in succeeding the Queen.
Her Majesty ruled over Britain and 14 Commonwealth nations for 70 years, becoming the longest-reigning monarch in the country's history.
She was beloved by millions and commanded huge respect on the global stage, with tributes flooding in from past and present world leaders following her death.
In recent days much has been said about the Queen's ability to never put a foot wrong.
Charles on the other hand was engulfed in string scandals as heir to the throne.
The breakdown in his marriage with Princess Diana caused serious damage to the royal family, especially after his ex-wife blamed him for having an affair.
She famously told BBC journalist Martin Bashir: "There were three of us in this marriage, so it was a bit crowded."
Charles also came under fire for his "black spider" memos - a series of letters that he sent to British politicians in an attempt to change Government policy.
However, His Majesty has now hinted he will stop all campaigning as monarch.
Not looking out of place in the cost of living crisis
Any lavish celebrations marking Charles' accession could prove unpopular as millions of Brits feel the squeeze in the current cost of living crisis.
The King will also be under pressure to reduce spending, with the latest figures showing that the royal family cost taxpayers £102.4million in 2021-22, nearly £15million more than the year before.
Many have argued that the monarchy is priceless and pays for itself in tourism.
However, the royals risk stoking resentment by if they fail to cut down spending in the cost of living crisis.
Charles reportedly has a plan to cut spending, keeping the monarchy in tune with the British public.
His coronation is projected to be shorter, cheaper and less ostentatious than the Queen's.
On top of his plans to reduce the number of senior royals, he is also said to be considering opening Buckingham Palace to the public.
The King could move into a new official residence at the London palace, where he will live in "little more than a flat above a shop" in an extremely downsized plan, while his permanent home at Highgrove will become a family home.
Charles is also said to be keen on revising the amount of property owned by the royals.
How to distribute the lavish royal properties
Charles may face squabbling between his relatives over the royal family's real estate portfolio now he is King.
His Majesty has reportedly inherited royal properties across the country following the Queen's death.
He is able to grant "grace-and-favour" residences to his friends and family as monarch.
The Queen previously gave Harry and Meghan Frogmore Cottage as a grace and favour residence in 2019.
The King now has control over a huge portfolio, including Buckingham Palace, Windsor Castle, Sandringham House, Balmoral Castle, St Jame's Palace, Kensington Palace, Holyroodhouse, Hampton Court Palace, Hillsorough Castle and Clarence House.
It is not yet clear whether the monarch will continue to allow Prince Andrew to live at the Royal Lodge in Windsor.
It is believed the King will make Clarence House his main home - even though the monarch has traditionally lived in Buckingham Palace.
There is even speculation Charles may open Buckingham Palace up to the public and potentially gift Balmoral to the nation.
The Scottish castle could be opened to the public all year round, the Telegraph reports.
The newspaper also reports that Charles may give Highgrove and Sandringham to Prince William.
