Juan Bautista Valentín Alvarado y Vallejo usually known as Juan Bautista Alvarado, was a Californio politician that served as Governor of Alta California from 1837 to 1842. Prior to his term as governor, Alvarado briefly led a movement for independence of Alta California from 1836 to 1837, in which he successfully deposed interim governor Nicolás Gutiérrez, declared independence, and created a new flag and constitution, before negotiating an agreement with the Mexican government resulting in his recognition as governor and the end of the independence movement.

Californios are Hispanic Californians, especially those descended from Spanish and Mexican settlers of the 17th through 19th centuries. California's Spanish-speaking community has resided there since 1683 and is made up of varying Spanish and Mexican origins, including criollos, Mestizos, Indigenous Californian peoples, and small numbers of Mulatos. Alongside the Tejanos of Texas and Neomexicanos of New Mexico and Colorado, Californios are part of the larger Spanish-American/Mexican-American/Hispano community of the United States, which has inhabited the American Southwest and the West Coast since the 16th century. Some may also identify as Chicanos, a term that came about in the 1960s.