A few years after the discovery of the Philippines, all places in the country had been explored by the Spanish authorities and the exploration of Zambales began in 1572 by Juan de Salcedo, grandson of Miguel Lopez de Legaspi, first Spanish Governor General of the Philippines. Juan de Salcedo and Spanish followers made a survey of its coastal region and organize communities which were first called encomiendas but which were later called pueblos. As the population of the villages increased which was caused by the steady immigration of Ilocanos from the Ilocandia region before 1800 until 1860, more pueblos were organized.