Rancho Paso de Robles was a 25,993-acre (105.19 km2) Mexican land grant in present-day San Luis Obispo County, California given in 1844 by Governor Manuel Micheltorena to José Pedro Narváez.
[2] The six square league Rancho Paso de Robles grant was made to José Pedro Narváez, a Mexican naval officer, who served as captain of the port of Monterey from 1839 to 1844.
In 1842 Ríos obtained the Rancho San Bernabe land grant and moved his family there.
[4] With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored.
[7] In 1857, Ríos sold Rancho Paso de Robles and moved to Santa Clara.
D. W. James had come from Kentucky to California in 1849, and drove cattle from Santa Clara to the gold mines.