Princess Anne is celebrating her 72nd birthday today, August 15.
Anne holds the title of Princess Royal and is the second child of Queen Elizabeth II and Prince Philip. She's also the monarch's only daughter.
Like her mother, Anne has a love of horses and she even competed in the 1976 Montreal Olympic Games as a member of the British equestrian team.
The princess is known as being of the most hard-working members of the Royal Family and has already had a busy year attending a number of official engagements as the Queen continues to suffer from mobility issues.
As she celebrates her birthday, here's everything you need to know about what Princess Anne's title means, what her duties are, and whether she is in line to the throne.
Is Princess Anne in line for the throne?
Princess Anne is in line for the throne, although at 72 years old it's unlikely that she will ever become queen.
When she was born, Anne was third in line to the throne, but now she is 17th in line.
The Princess Royal's place in the line of succession, however, falls behind her younger brothers Prince Edward and Prince Andrew.
This is because of a now-outdated law that means that the male heirs in the Royal Family are placed ahead of their sister.
The 2013 Succession of the Crown Act, which came into force in 2015, removed the male bias in the line of succession and ended the system of male heirs automatically inheriting the throne over female heirs.
It means that unlike Princess Anne, Princess Charlotte is second in line to the throne, ahead of her younger brother Prince Louis.
Unfortunately for Anne, the act doesn't apply retroactively so she is still behind her younger brothers and their children.
What does the title of Princess Royal mean?
The title of Princess Royal is the title that is traditionally bestowed to the eldest daughter of the monarch.
It is a title that remains for life, so Princess Anne will hold it until her death.
The title will then likely be bestowed to Princess Charlotte, although there is no guarantee of this and Prince William will get to decide whether she is given the title.
Princess Anne only became the Princess Royal in 1897, at the age of 36.
The title was previously held by the Queen's aunt Mary, who died in 1965, leaving the title free for over two decades before it was given to Anne.
The Royal Family have never confirmed the reason for the long wait.
What is the role of the Princess Royal?
As Princess Royal, Anne has one of the busiest schedules of any member of the Royal Family.
The Princess' job is to support the Queen in her role as Head of State and to do this she represents the monarch at events in the UK and abroad and also performs a number of other official duties and engagements, such as attending state and ceremonial occasions alongside other members of the Royal Family.
Princess Anne started undertaking public work when she was 18 and her first engagement was the opening of an educational and training centre in Shropshire in 1969.
The Princess Royal is now involved with over 300 charities, organisations and military regiments and has been president of Save the Children since 1970.
This year, Princess Anne has filled in for the Queen at a number of events as Her Majesty has been suffering from episodic mobility problems.
