20th-century British monarchs

Elizabeth II was Queen of the United Kingdom and other Commonwealth realms from 6 February 1952 until her death in 2022. She was queen regnant of 32 sovereign states during her lifetime and was the monarch of 15 realms at her death. Her reign of 70 years and 214 days is the longest of any British monarch, the second-longest of any sovereign state, and the longest of any queen regnant in history.

Victoria was Queen of the United Kingdom of Great Britain and Ireland from 20 June 1837 until her death in 1901. Her reign of 63 years and 216 days, which was longer than those of any of her predecessors, constituted the Victorian era, a period of industrial, political, scientific, and military change within the United Kingdom marked by a great expansion of the British Empire. In 1876, the British parliament voted to grant her the additional title of Empress of India.

George VI was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death in 1952. He was also the last Emperor of India from 1936 until the British Raj was dissolved in August 1947, and the first Head of the Commonwealth following the London Declaration of 1949.

George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 until his death in 1936.

Edward VIII, later known as the Duke of Windsor, was King of the United Kingdom and the British Dominions, and Emperor of India, from 20 January 1936 until his abdication in December of the same year.

Edward VII was King of the United Kingdom and the British Dominions, and Emperor of India, from 22 January 1901 until his death in 1910.