As King Charles III receives treatment for cancer, he remains Britain’s monarch and head of state. This is the order of succession to the throne:

1. Prince William, the eldest son of Charles and the late Princess Diana. He is known as Prince of Wales and is married to Kate, Princess of Wales. Their three children follow him in the line of succession.
2. Prince George of Cambridge, born in July 2013.
3. Princess Charlotte of Cambridge, born in May 2015.
4. Prince Louis of Cambridge, born in April 2018.
5. Prince Harry, the younger son of Charles and Diana, who has relinquished his royal duties but retains his place in line
6. Archie Mountbatten-Windsor, born to Harry and Meghan, Duchess of Sussex, in May 2019
7. Lilibet Mountbatten-Windsor, born to Harry and Meghan in June 2021
8. Prince Andrew, Queen Elizabeth II and Prince Philip’s second-eldest son
9. Princess Beatrice, elder daughter of Andrew and his former wife, Sarah Ferguson
10. Sienna Elizabeth, daughter of Beatrice and Edoardo Mapelli Mozzi, born in September 2021
11. Princess Eugenie, Andrew and Ferguson’s younger daughter
12. August Brooksbank, born to Eugenie and James Brooksbank in Feb. 2021
13. Ernest Brooksbank, born to Eugenie and James Brooksbank in May 2023
14. Prince Edward, the queen and Philip’s youngest child
15. James, Viscount Severn, son of Edward and his wife Sophie, Duchess of Edinburgh.

• An AP report