 In 1601 it was mandated by the Spanish viceroy in Mexico City that safe ports be found, one of which would be San Diego Bay, for returning Spanish trade ships from Manila to Acapulco.During this mission, the explorer Sebastián Vizcaíno was also told to map the California coast in great detail; leading to the further exploration of the modern day site of San Diego–Tijuana.The Kumeyaay, referred to as Diegueño by the Spanish, are the original inhabitants of San Diego County and northern Baja California.