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Before the Mexican War the district was part of a rancho, and after the American victory it was converted into wheat farms and then subdivided, with part of it named Owensmouth as a town founded in 1912.
Governor Manuel Micheltorena gave a Mexican land grant of the Island of Santa Rosa, in the Channel Islands of California, to Carlos and his brother José Antonio Carrillo in 1843.
The rancho, which was commonly spoken of, or was in the rancho days, as the Colonia, extended from the Santa Clara River south to the present day Point Mugu Naval Air Station, or to the boundary of Rancho Guadalasca, and east from the Pacific Ocean to the present day 101 Freeway, or to the boundary of Rancho Santa Clara del Norte.
The Sepulvedas, Estudillos, Zameranos and other grantholders, had their huge family carriages, drawn by the biggest mules money could buy, but a decade had passed before anybody began to think of purchasing fast horses for their buggies.
José Antonio Carillo was the Mexican land grant grantee of Rancho Las Posas in 1834, in present day Ventura County, California, and the Island of Santa Rosa of the Channel Islands.