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. The Rancho San Jacinto Sobrante grant was of the surplus or "sobrante" of Jose Antonio Estudillo's Rancho San Jacinto Viejo and Miguel Pedrorena's Rancho San Jacinto Nuevo y Potrero. The grant encompassed present day Lake Mathews. At the time of the US patent, Rancho San Jacinto Sobrante was a part of San Bernardino County. The County of Riverside was created by the California Legislature in 1893 by taking land from both San Diego and San Bernardino Counties.
María del Rosario Estudillo was the daughter of José Antonio Estudillo, grantee of Rancho San Jacinto Viejo. José Antonio Estudillo was appointed administrator and majordomo at Mission San Luis Rey in 1840. Three grants, comprising over 133,000 acres (538 km2) of the former Mission San Luis Rey lands in the San Jacinto area were made to the Estudillo family: Rancho San Jacinto Viejo to José Antonio Estudillo in 1842; Rancho San Jacinto Nuevo y Potrero to his son-in-law, Miguel Pedrorena, in 1846; and the five square league Rancho San Jacinto Sobrante to his daughter, María del Rosario Estudillo, in 1846.
María del Rosario Estudillo was married to José Antonio Aguirre (1799–1860). Before she died, Aguirre had been married to María del Rosario's sister, Francisca Estudillo, eldest daughter of José Antonio Estudillo. José Antonio Aguirre owned one-half of Rancho El Tejon. In 1853, José Antonio Aguirre bought Rancho San Jacinto Nuevo y Potrero from the estate of Aguirre's brother-in-law Miguel Pedrorena.
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