Ernest Augustus, Crown Prince of Hanover, 3rd Duke of Cumberland and Teviotdale, was the eldest child and only son of George V of Hanover and his wife, Marie of Saxe-Altenburg. Ernest Augustus was deprived of the throne of Hanover upon its annexation by Prussia in 1866 and later the Duchy of Brunswick in 1884. Ernest Augustus was deprived of his British peerages and honours for having sided with Germany in World War I.

George V was the last king of Hanover, reigning from 18 November 1851 to 20 September 1866. The only child of King Ernest Augustus and Queen Frederica, he succeeded his father in 1851. George's reign was ended by the Austro-Prussian War, after which Prussia annexed Hanover.