Rancho Sespe was a 8,881-acre (35.94 km2) Mexican land grant in present-day Ventura County, California given in 1833 by Governor José Figueroa to Carlos Antonio Carrillo.[1] The grant encompassed the Santa Clara River Valley between Piru Creek on the east and Santa Paula Creek on the west, and was bounded to the north and south by the mountains, and included present day Fillmore.[2]