Following the death of Queen Elizabeth II, Charles automatically became King.
The Queen passed away peacefully at Balmoral, Aberdeenshire on Thursday (September 8) afternoon with Charles and Anne said to both be by her side at the time.
As the eldest son of the Monarch, the former Prince of Wales received the title from the Queen in 1958. The heir to the throne traditionally holds the title, despite Charles becoming heir six years earlier in 1952.