De colonia agrícola a municipio: el origen de San Martín del Tesorillo Historical milestone · San Martín del Tesorillo, Campo de Gibraltar, Cádiz The settlement of San Martín del Tesorillo originated in 1869 with the purchase of large estates from the house of Medina Sidonia, and in 1879 it was declared an agricultural colony. In the 1930s it was divided into plots for new settlers. 1869; 1879; años 1930 Photo: ZC.Marbella (CC BY-SA 4.0) What to see and do in San Martín del Tesorillo