The reliable sources of British history do not use the term "British Emperor," nor did the government. The term "British Empire" is an unofficial designation and does not imply there was a person called "emperor." The term "emperor" has sometimes informally been retroactively applied to a few mythical and historical rulers of Great Britain, Ireland or the United Kingdom. It was sometimes used informally to designate either Plantagenet and Tudor caesaropapism. The term "Emperor of India" was officially a title for Queen Victoria and her successors down to 1948. There was never an official entity named "Empire of India." See British Raj for the part of India that Britain controlled.