Joshua Abraham Norton (February 4, 1818 – January 8, 1880) was a resident of San Francisco, California, who in 1859 declared himself "Emperor of these United States" in a proclamation that he signed "Norton I., Emperor of the United States". Commonly known as Emperor Norton, he took the secondary title "Protector of Mexico" in 1866.
Born in England and raised in South Africa, Norton left Cape Town in late 1845, sailing from Liverpool to Boston in early 1846 and eventually arriving in San Francisco in late 1849. After a brief period of prosperity, Norton made a business gambit in late 1852 that played out poorly, ultimately forcing him to declare bankruptcy in 1856. Norton proclaimed himself "Emperor of these United States" in September 1859, a role he played for the rest of his life. Norton had no formal political power but was treated deferentially in San Francisco and elsewhere in California, and currency issued in his name was honored in some of the establishments he frequented.