British Israelism (also called Anglo-Israelism) is the British nationalist, pseudoarchaeological, pseudohistorical and pseudoreligious belief that the people of Great Britain are "genetically, racially, and linguistically the direct descendants" of the Ten Lost Tribes of ancient Israel. With roots in the 16th century, British Israelism was inspired by several 19th century English writings such as John Wilson's 1840 Our Israelitish Origin. From the 1870s onward, numerous independent British Israelite organizations were set up throughout the British Empire as well as in the United States; as of the early 21st century, a number of these organizations are still active. In the United States, the idea gave rise to the Christian Identity movement.
The central tenets of British Israelism have been refuted by archaeological, ethnological, genetic, and linguistic research.
According to Brackney (2012) and Fine (2015), the French Huguenot magistrate M. le Loyer's The Ten Lost Tribes, published in 1590, provided one of the earliest expressions of the belief that the Anglo-Saxon, Celtic, Scandinavian, Germanic, and associated peoples are the direct descendants of the Old Testament Israelites. Anglo-Israelism has also been attributed to King James VI and I, who believed he was the King of Israel. Adriaan van Schrieck (1560–1621), who influenced Henry Spelman (1562–1641) and John Sadler (1615–74), wrote in the early 17th century about his ideas on the origins of the Celtic and Saxon peoples. In 1649, Sadler published The Rights of the Kingdom, "which argues for an 'Israelite genealogy for the British people'".
Aspects of British Israelism and its influences have also been traced to Richard Brothers, who published A Revealed Knowledge of the Prophecies and Times in 1794, John Wilson's Our Israelitish Origin (1844), and John Pym Yeatman's The Shemetic Origin of the Nations of Western Europe (1879).
British Israelism arose in England, then spread to the United States.