A presidio (from the Spanish, presidio, meaning "jail" or "fortification") is a fortified base established by the Spanish in areas under their control or influence. The term is derived from the Latin word praesidium meaning protection or defense.
In the Americas, the fortresses were built to protect against pirates and hostile Native Americans, as well as colonists from enemy nations. In the Mediterranean and the Philippines, the presidios were outposts of Christian defense against Islamic raids. The presidios of Spanish-Philippines in particular, were centers where the martial art of Arnis de Mano was developed, combining Filipino, Latin-American and Spanish fighting techniques. Later in western North America, with independence, the Mexicans garrisoned the Spanish presidios on the northern frontier and followed the same pattern in unsettled frontier regions like the Presidio de Sonoma, at Sonoma, California and the Presidio de Calabasas, in Arizona.
In western North America, a rancho del rey or king's ranch would be established a short distance outside a presidio. This was a tract of land assigned to the presidio to furnish pasturage to the horses and other beasts of burden of the garrison. Mexico called this facility "rancho nacional".
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Gerald, Rex 1968 Spanish Presidios of the Late Eighteenth Century in Northern New Spain. Museum of New Mexico Press, Santa Fe.