The Royal Family is a large and complex institution, often dictated by rules stretching back hundreds of years.
And as the country mourns the Queen's death, you may be wondering why royals have so many different titles – and what they all mean.
Here is everything you need to know about royal titles.
Why do royals have multiple titles?
It is tradition for senior royals have numerous titles and honours, although they typically only go by their highest-ranking one.
The titles they use depend on how senior they are, and on which part of the UK they are visiting.
For example, Prince William's main title is Prince of Wales – but when in Scotland, he's referred to as Duke of Rothesay, and in Cornwall he's Duke of Cornwall.
He has a string of other titles, including Earl of Carrick, Baron of Renfrew, and Lord of the Isles.
William inherited most of his titles after King Charles III took the throne, due to his position as eldest son of the monarch.
But he also retains three titles he was given on his wedding day in 2011: Duke of Cambridge, Earl of Strathearn, and Baron Carrickfergus.
Senior royals also use the HRH style, which stands for His or Her Royal Highness.
What does Queen Consort mean?
The wife of a King automatically becomes a Queen Consort, meaning that Camilla has held this title since Charles became monarch.
When she married Charles in 2005, there was much debate about what Camilla would eventually be called.
Royal aides insisted that Camilla would simply choose not to call herself queen and be known as Princess Consort.
Read more: What will King Charles' reign be called?
But on the eve of her Platinum Jubilee in February 2022, Elizabeth II endorsed the then-Duchess of Cornwall to be known as Queen when the time came.
The Queen said it was her "sincere wish" that Camilla would take the title.
Do Harry, Meghan and Andrew still have royal titles?
Prince Harry and Meghan are still known as the Duke and Duchess of Sussex, despite stepping down as senior royals in 2020.
They also still hold two other titles: the Earl and Countess of Dumbarton in Scotland, and the Baron and Baroness Kilkeel in Northern Ireland.
Meghan and Harry were granted these monikers by Queen Elizabeth II on their wedding day in 2018.
The couple no longer use their HRH styles, although they technically still hold them.
Prince Andrew stopped using the HRH style in the wake of his civil sex case in 2022, but is still known as the Duke of York.
Peerages, such as the rank of duke, can only be removed by an act of Parliament.
Despite not being frontline royals, both Harry and Andrew are still princes by birthright, under rules set out by King George V in 1917.
Why is Meghan a duchess, not a princess?
As the wife of a prince, Meghan is technically a princess. However, she is known as Duchess of Sussex, rather than Princess Meghan, due to royal convention.
Princess titles are typically reserved for those born into the Royal Family – such as Princess Charlotte and Princess Anne – rather than those who marry into it.
After Diana married Charles in 1981, she was widely known to the public as Princess Diana. However, this title was not strictly accurate.
She was technically 'Her Royal Highness the Princess of Wales' during her marriage, then 'Diana, Princess of Wales' after her divorce.
Why isn't Prince Edward a duke?
Unlike his brother Andrew, Prince Edward is not a duke.
Instead, he is known as the Earl of Wessex, a role bestowed upon him on his wedding day in 1999 – apparently due to his love of a rom-com.
A royal courtier told The Telegraph in 2010: "Prince Edward was going to be the Duke of Cambridge, but he watched the film Shakespeare in Love, which had a character called the Earl of Wessex.
"He liked the sound of it and asked the Queen if he could have that instead."
Since 2019, he has been known as Earl of Forfar when in Scotland.
Watch: Queen leaves Buckingham Palace for last time before lying in state