Livermore Valley was named after Robert Livermore, an immigrant American rancher in Mexican Alta California, who with his business partner José Noriega were keeping livestock in the valley since 1834. Livermore and Jose Noriega received the Mexican land grant for Rancho Las Positas, which encompassed the valley, in 1839 from Governor Juan Bautista Alvarado.
In 1847 Noriega and Livermore purchased Rancho Canada de los Vaqueros adjacent to the north of Rancho Las Positas and Livermore Valley in the Diablo Range.
Livermore's name became well known during the California Gold Rush in the late 1840s−early 1850s, for an inn at his adobe ranch house in the valley that served miners and other travelers eastbound on the road from the Bay Area through the Diablo Range's passes to the Mother Lode region in the Sierra Nevada.
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