Rancho Suey was a 48,834-acre (197.62 km2) Mexican land grant in present-day southern San Luis Obispo County and northern Santa Barbara County, California given in 1837 by Governor Juan B. Alvarado to María Ramona Carrillo de Pacheco.
[5] Pacheco died defending the widely despised centralist Mexican governor of California, Manuel Victoria, at the Battle of Cahuenga Pass in 1831.
His widow, María Ramona Carrillo de Pacheco was given the five-square-league Rancho Suey land grant by Governor Alvarado in 1837.
In 1845, Wilson built an adobe home on Rancho Cañada de los Osos y Pecho y Islay and lived there with his family until his death in 1860.
[7] 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.