Charles has become Britain’s new King following the death of his mother, Queen Elizabeth II, at the age of 96.
The Queen became the sixth female to ascend to the British throne in February 1952, after the death of her father, King George VI. She was the longest-reigning monarch in British history, serving for more than 70 years.
Charles, the Queen’s eldest son, immediately ascended to the throne as King, putting his elder son, William, first in line for the throne.
Here’s what we know about the British royal family’s line of succession.
King Charles III
In pictures: Britain's King Charles III
Born: November 14, 1948
What to know: Charles was the longest serving British monarch-in-waiting; he was the heir apparent since the age of three.
President of The Prince’s Trust and the Royal Shakespeare Company, and president or patron of more than 400 charitable organizations, Charles was the first royal heir to earn a university degree.
More key relatives: Diana, Princess of Wales, to whom he was married from 1981 to 1996. They had two children together: Princes William and Harry.
Princess Diana: Her life and legacy
Diana died in 1997 following a car accident in Paris, along with boyfriend Dodi Fayed and driver Henri Paul.
In 2005, Charles married Camilla, the Queen Consort.
Prince William, Prince of Wales
The heir apparent: Britain's Prince William
Born: June 21, 1982
What to know: William, Prince of Wales is first in line to the throne. He has achieved the highest educational degree – Master of Arts – of any member of the royal family. He served in the military from 2006 to 2013, participating in more than 150 helicopter search and rescue operations.
More key relatives: Catherine, Princess of Wales, whom he married in 2011. The couple have three children together: Prince George, 9; Princess Charlotte, 7; and Prince Louis, 4.
Will and Kate's royal family
The family live in Adelaide Cottage, a four-bedroom property on the grounds of Windsor Castle, Berkshire, about 25 miles from London. Their London residence, Kensington Palace, will remain the family’s principal residence, however, a royal source told CNN in August.
Born: July 22, 2013
What to know: If all goes as planned and he becomes King after the reigns of his grandfather Prince Charles and his father Prince William, George – now second in line – will be the 43rd monarch since William the Conqueror.
But for now, he’s still brushing up on his education: George