Juan Bautista ValentÃn Alvarado y Vallejo (February 14, 1809 – July 13, 1882) was a Californio and Governor of Las Californias from 1837 to 1842.
In 1836, he led a coup that seized Monterey and declared himself governor, backed by other northern Californios, with help from Capt.
Isaac Graham and his "Tennessee Rifles".
Alvarado declared independence for California but, after negotiations with the territorial Diputación (Legislature), was persuaded to rejoin Mexico peacefully in exchange for more local autonomy.
As part of the agreement, in 1837 he was appointed governor of Las Californias, and served until 1842.