Rancho Ciénega de los Paicines was a 8,918-acre (36.09 km2) Mexican land grant and present-day ranch in present day San Benito County, California given in 1842 by Governor Juan B. Alvarado to Ángel María Castro and José Antonio Rodríguez.
The grant extended along the San Benito River with Tres Pinos Creek on the east and the Cienega Valley on the west, and encompassed present day Paicines.
[2][3] The two square league Rancho Ciénega de los Paicines grant was given to Angel María Castro and his son-in-law José Antonio Rodriguez.
José Antonio Rodriguez (–1853), son of Sebastian Rodriguez (grantee of Rancho Bolsa del Pajaro) and Maria Pacheco, was a guard at Mission San Miguel and married Hilaria (Elisaria) Castro (1817–), the daughter of Angel Delores Castro and Maria Ysabel Butron 1835.
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.