Colony of Spain|
(Territory of the Viceroyalty of New Spain from 1626 to 1642)
|Capital||San Salvador (Keelung)|
|Common languages||Spanish, Formosan languages|
|Historical era||Age of Discovery|
• Surrender of San Salvador
|Today part of||Republic of China|
Part of a series on the
|History of Taiwan|
Spanish Formosa ( Spanish: Formosa Española) was a small Spanish colony established in the northern tip of the island known to Europeans at the time as Formosa (now Taiwan) from 1626 to 1642. It was conquered by the Dutch in the Eighty Years War.
The Portuguese were the first Europeans to reach the island off the southern coast of China in 1544, and named it Formosa (Portuguese for "beautiful") due to the beautiful landscape as seen from the sea.  The Spanish colony was meant to protect the regional trade with the Philippines from interference by the Dutch base in the south of the island. The colony was short-lived due to the unwillingness of Spanish colonial authorities in Manila to commit more men and materiel to its defense.
After seventeen years, the last fortress of the Spanish was besieged by Dutch forces and eventually fell, giving the Dutch control over much of the island.
As a result of the personal union of the Spanish and Portuguese crowns in 1580, Spanish Habsburg monarchs ruled Portugal and its colonies as the King of Portugal. The Dutch of the Seventeen Provinces as well as their allies England and France became enemies of both Portugal and Spain.
The Spanish Habsburgs cut the Dutch rebels off from the spice markets in Lisbon, making it necessary for the Dutch to send their own expeditions to the sources of these commodities to take control of the much desired spice trade in the East Indies.
The Dutch colonization of Formosa was part of a campaign designed to seize all the possessions of the Spanish Habsburgs in Asia, including the Philippines. The Dutch began to take a string of often undermanned coastal fortresses that comprised the Habsburg's Portuguese African and Asian possessions, taking full advantage of the many enemies and pirates that the Habsburgs had to defend their global empire against. The settlements were isolated, difficult to reinforce if attacked, and prone to being picked off one by one, but nevertheless the Dutch only enjoyed mixed success in its attempts to take them. 
Pursuing their quest for alternative routes to Asia for trade, the first Dutch squadron to reach the Philippines on 14 December 1600 was led by Olivier van Noort. The Dutch sought to dominate the commercial sea trade in Southeast Asia, even engaging in privateering. They disrupted trade by harassing the coasts of Manila bay and its environs, and preyed on sampans and junks from China and Japan trading at Manila.
In the context of this competition for trade, the Dutch established a colony at Tayouan, present-day Anping, in the south of Formosa. From there the Dutch were able to threaten Spain's trade in the region. As a counter to this threat, the Spanish colonial authorities in Manila decided to establish their own colony in the north of the island.
Landing at Cape Santiago in the north-east of Formosa but finding it unsuitable for defensive purposes, the Spanish continued westwards along the coast until they arrived at Keelung.  A deep and well-protected harbour plus a small island in the mouth of the harbour made it the ideal spot to build the first settlement, which they named Santissima Trinidad. Forts were built, both on the island and in the harbour itself.
In 1641, the Spanish colony in the north had become such an irritant to the Dutch in the south that it was decided to take northern Formosa by force. In courteous terms, the Dutch Governor Paulus Traudenius informed the Spanish governor of their intentions.
I have the honor to communicate to you that I have received the command of a considerable naval and military force with the view of making me master by civil means or otherwise of the fortress Santissima Trinidad in the isle of Ke-lung of which your Excellency is the Governor.
In accordance with the usages of Christian nations to make known their intentions before commencing hostilities, I now summon your Excellency to surrender. If your Excellency is disposed to lend an ear to the terms of capitulation which we offer and make delivery to me of the fortress of Santissima Trinidad and other citadels, your Excellency and your troops will be treated in good faith according to the usages and customs of war, but if your Excellency feigns to be deaf to this command there will be no other remedy than recourse to arms. I hope that your Excellency will give careful consideration to the contents of this letter and avoid the useless effusion of blood, and I trust that without delay and in a few words you will make known to me your intentions.
May God protect your Excellency many years,
The Friend of your Excellency,
PAULUS TRAUDENIUS 
The Spanish governor was not inclined to give in so easily, and replied in kind.
Sir; I have duly received your communication of August 26th, and in response I have the honor to point out to you that as becomes a good Christian who recalls the oath he has made before his king, I cannot and will not surrender the forts demanded by your Excellency, as I and my garrison have determined to defend them. I am accustomed to find myself before great armies, and I have engaged in numerous battles in Flanders as well as other countries, and so I beg of you not to take the trouble of writing me further letters of like tenor. May each one defend himself as best he can. We are Spanish Christians and God in whom we trust is our protector.
May the Lord have mercy on you.
Written in our principal fortress San Salvador the 6th of September 1641.
GONSALO PORTILIS 
Subsequently, the Dutch launched an assault on the northern regions held by the Spanish, but the positions were well-defended and the attacking troops were not able to breach the walls of the fortresses. They returned, thwarted and humiliated, to the Dutch base at Fort Zeelandia.
In August 1642, The Dutch returned to Keelung with four large ships, several smaller ships, and approximately 369 Dutch soldiers.  A combination of Spaniards, aboriginals, and Pampangos from the Philippines held off the Dutch for six days. They eventually surrendered and were returned to Manila defeated, and giving up their flags and what little artillery remained with them.  Sebastián Hurtado de Corcuera, governor of the Philippines, was blamed for the loss of Formosa and was eventually tried in court for his actions.  Upon conviction, he was imprisoned for five years in the Philippines. Historians since Corcuera's time have chastised him for the loss of the settlement in Formosa  but other factors, such as the continuing rise of the Dutch Empire in Southeast Asia, and financial troubles within the over-stretched empire, were also contributing factors.
- Sujuan, Zhan (2012-05-22). "The Taiwan Encyclopedia". Council for Cultural Affairs. Retrieved 2012-05-22.
- Boxer, C. R. (1969). The Portuguese seaborne empire 1415-1825. London: Hutchinson. p. 23. ISBN 0090979400.
- Davidson (1903), p. 19.
- Davidson (1903), p. 20.
- Davidson (1903), p. 21.
- Andrade, Tonio (2005). How Taiwan Became Chinese: Dutch, Spanish and Han Colonization in the Seventeenth Century. Columbia University Press.
- Jose Eugenio Barrio (2007). "An Overview of the Spaniards in Taiwan" (pdf). University of Taiwan Foreign Languages in Literature. University of Taiwan. Retrieved 2012-05-16.