Queen Elizabeth II was the longest-reigning monarch in British history, serving from February 6, 1952, until her death on September 8, 2022. She was born on April 21, 1926, in London, England, and became queen at the age of 25 after the death of her father, King George VI. During her reign, Queen Elizabeth II witnessed significant changes in the world, including the decline of the British Empire and the rise of the Commonwealth. She was known for her dedication to public service and her role in modernizing the monarchy, making it more accessible to the public.