Rancho Las Posas

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Rancho Las Posas was a 26,623-acre (107.74 km2) Mexican land grant in present day Ventura County, California given in 1834 by Governor José Figueroa to José Antonio Carrillo.[1] The grant extends along the Simi Valley from near present day Moorpark to Camarillo. Rancho Simi borders it on the east, the Rancho Calleguas on the south, Rancho Santa Clara del Norte on the west, and a range of mountains on the north.[2]


Captain José Antonio Ezequiel Carrillo (1796–1862) was the son of the José Raimundo Carrillo. He served three non-consecutive terms as alcalde of Los Angeles between 1826 and 1834. His brother, Carlos Antonio Carrillo,was granted Rancho Sespe in 1833 by Governor Figueroa. He married Estefana Pico (1806–) in 1823, and after her death, Jacinta Pico (1815–) in 1842; both were sisters of Pío and Andrés Pico.[3] José Antonio Carillo also grantee of the Island of Santa Rosa.

Captain José de la Guerra y Noriega (1779 –1858) was Comandante of the Presidio of Santa Barbara from 1827 to 1842. De La Guerra married José Antonio Carrillo's sister, María Antonia Carrillo (1786–1843), in 1804. José de la Guerra y Noriega, who had begun to acquire large amounts of land in California to raise cattle, purchased Rancho Las Posas from the Carrillo family in 1842.

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. As required by the Land Act of 1851, a claim for Rancho Las Posas was filed with the Public Land Commission in 1852,[4] and the grant was patented to José de la Guerra y Noriega in 1881.[5]

After Jose de la Guerra’s death in 1858, the rancho was held by his heirs until 1870, when it was sold to the Philadelphia and California Petroleum Company headed by Pennsylvania Railroad president, Thomas Alexander Scott and his agent Thomas R. Bard.[6]


  1. ^ Ogden Hoffman, 1862, Reports of Land Cases Determined in the United States District Court for the Northern District of California, Numa Hubert, San Francisco
  2. ^ Diseño del Rancho Las Posas
  3. ^ Jose Antonio Ezequiel Carrillo (1796-1862)
  4. ^ United States. District Court (California : Southern District) Land Case 117 SD
  5. ^ Report of the Surveyor General 1844 - 1886
  6. ^ Tomás Almaguer, 1994, Racial Fault Lines: The Historical Origins of White Supremacy in California, University of California Press, ISBN 978-0-520-08947-1

Coordinates: 34°15′36″N 119°01′48″W / 34.260°N 119.030°W / 34.260; -119.030