Rancho Santa Ana

Rancho Santa Ana was a 21,522-acre (87.10 km2) Mexican land grant in present day Ventura County, California given in 1837 by Governor Juan Alvarado to Crisogono Ayala and Cosme Vanegas.

Rancho Santa Ana encompassed present day Lake Casitas and Oak View.

[2] The four square league Rancho Santa Ana was granted to Crisógono Ayala and his father-in-law Cosme Vanegas was part of the lands of Mission San Buenaventura.

Jose Crisógono Dolores Ayala (1793–1866) married Bárbara Bernidina Vanegas (1800–).

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.