Rancho San Jacinto Sobrante

Rancho San Jacinto Sobrante was a 48,847-acre (197.68 km2) Mexican land grant in present-day Riverside County, California given in 1846 by Governor Pío Pico to María del Rosario Estudillo de Aguirre.

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.

[5][6] In 1854, the Commission found that María del Rosario Estudillo de Aguirre was entitled to five square leagues of land.

An appeal taken to the US Supreme Court in 1863, affirmed the eleven square leagues,[7] and the grant was patented to María del Rosario Estudillo de Aguirre in 1867.

In 1888, the United States unsuccessfully sought to have the US Supreme Court declare the patent void based upon the grounds of a fraudulent survey by persons who the beneficiaries thereof.

María del Rosario Estudillo de Aguirre, a member of the Estudillo family of California and wife of José Antonio Aguirre , was granted Rancho San Jacinto Sobrante in 1846.