Early Modern1609–1768
Jesuit Reductions of Paraguay (1609): Missions of the Guaraní
The Jesuit reductions of Paraguay were mission towns founded from 1609 among the Guaraní. Their economy, defence against slave raiders, the Guaraní War, 1767.

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The Jesuit reductions of Paraguay were a network of mission towns that Jesuit priests founded among the Guaraní people from 1609, in a frontier region now divided between Paraguay, Argentina and Brazil. For more than 150 years these towns sheltered tens of thousands of Guaraní from slave raiders and forced labour, until the Spanish crown expelled the Jesuits in 1767. Their red stone ruins remain among the most striking monuments of colonial South America.
Background
The word “reduction” comes from the Spanish reducción, meaning the gathering of dispersed Indigenous villages into a single settlement. Spanish authorities used the method across the Americas to convert, tax and control Indigenous peoples. Elsewhere it was often tied to the encomienda system, under which settlers could demand labour from Indigenous communities.
The Society of Jesus created its Province of Paraguay in 1604. With the support of the crown and of the governor Hernando Arias de Saavedra, known as Hernandarias, the Jesuits obtained an important concession: Guaraní in their missions would answer directly to the crown and would not be handed to Spanish settlers as encomienda labour.
Founding and the slave raids
San Ignacio Guazú, founded in 1609 by Marcial de Lorenzana, is generally counted as the first reduction. In 1610 the Jesuits José Cataldino and Simón Maceta founded Loreto and San Ignacio Miní in the Guairá region, east of the Paraná River.
The Guairá missions lay close to Portuguese Brazil. From the late 1620s raiding parties from São Paulo, known as bandeirantes, attacked the towns and carried off thousands of Guaraní to be sold as slaves. In 1631 the Jesuit Antonio Ruiz de Montoya led the surviving inhabitants of Loreto and San Ignacio Miní, many thousands of people, on an exodus down the Paraná, past the great falls, to new sites further south. Many died of hunger and disease on the way.
The decisive change came when the crown allowed the Guaraní to carry firearms. In March 1641 a Guaraní force defeated a large bandeirante expedition at Mbororé on the Uruguay River. After this victory the missions were largely safe from slave raids, and the Guaraní militia later served the Spanish crown in frontier campaigns.
Life and economy in the towns
At their height the missions numbered about thirty towns, often called the Thirty Towns of the Guaraní. Mission censuses record a peak population of around 140,000 people in the early 1730s. Each town usually had only two resident Jesuits; daily government lay with a council of Guaraní officials modelled on the Spanish town council.
Towns followed a common plan. A large central square was flanked by the church, the priests’ residence, workshops, storerooms and a cemetery, with long rows of family dwellings around it. Land was divided between family plots and communal land, the produce of which supported widows, orphans, the sick and the church, and paid the tribute owed to the king.
The missions raised large herds of cattle and traded yerba mate, a caffeine-rich tea, as well as cotton cloth. Guaraní craftsmen built stone churches, carved statues and made musical instruments, and mission choirs and orchestras became famous. The Jesuits used Guaraní as the language of daily life and worship, and from about 1700 printed books in it on presses built in the missions.
The Guaraní War
In the Treaty of Madrid of 1750, Spain and Portugal redrew the colonial boundary that had been set by the Treaty of Tordesillas. Spain received the Portuguese outpost of Colonia del Sacramento, and in return seven mission towns east of the Uruguay River were to pass to Portugal, with their roughly 30,000 inhabitants ordered to move.
Many Guaraní refused to leave their towns, churches and fields. The resulting Guaraní War of 1754–1756 ended when a joint Spanish and Portuguese army defeated them. The Guaraní leader Sepé Tiaraju was killed on 7 February 1756, and three days later around 1,500 Guaraní died at the Battle of Caiboaté. The treaty was annulled in 1761, but the missions had been badly shaken.
Expulsion and decline
Critics in Europe accused the Jesuits of running a private state, hoarding wealth and stirring up the Guaraní. Portugal expelled the order in 1759, and on 27 February 1767 Charles III of Spain decreed its expulsion from all Spanish dominions. The order was carried out in the Guaraní missions in 1768 under the governor of Buenos Aires, Francisco de Paula Bucareli.
Civil administrators took over, and the towns declined. Many Guaraní left for cities and ranches, population fell steeply, and the wars of the early nineteenth century destroyed several towns.
Myths and facts
The missions have often been described as a “Jesuit republic” or an early communist utopia. In fact they remained part of the Spanish Empire, paid tribute and obeyed royal officials, and private family plots existed alongside communal land.
Admirers and critics both exaggerated. Voltaire’s Candide satirised the Jesuits of Paraguay, while other writers idealised the missions as a Christian paradise. Historians today stress the active role of Guaraní leaders, who shaped mission life and bargained with both priests and officials.
Timeline
- 1604: The Jesuit Province of Paraguay is established.
- 1609: San Ignacio Guazú is founded, usually counted as the first reduction.
- 1610: Loreto and San Ignacio Miní are founded in the Guairá region.
- 1631: Antonio Ruiz de Montoya leads thousands of Guaraní away from Guairá after bandeirante raids.
- 1641, March: Armed Guaraní defeat a bandeirante expedition at Mbororé.
- 1750: The Treaty of Madrid assigns seven mission towns to Portugal.
- 1756, February: Sepé Tiaraju is killed and the Guaraní are defeated at Caiboaté.
- 1767, 27 February: Charles III decrees the expulsion of the Jesuits from Spanish dominions.
- 1768: The Jesuits leave the Guaraní missions.
Why it matters
The reductions were one of the largest and longest-lasting missionary experiments in the Americas. They protected many Guaraní from enslavement, helped preserve the Guaraní language, which is today an official language of Paraguay, and left a heritage of baroque architecture and music. Their ruins at San Ignacio Miní, São Miguel das Missões, Trinidad and Jesús de Tavarangue are UNESCO World Heritage Sites.
Frequently asked questions
What were the Jesuit reductions?
They were planned mission towns in which Jesuit priests gathered, or 'reduced', scattered Indigenous communities so that they could be evangelised and governed. The best known were the roughly thirty towns among the Guaraní in the Río de la Plata region, founded from 1609 onwards.
When was the first Jesuit reduction in Paraguay founded?
San Ignacio Guazú, founded in 1609 by the Jesuit Marcial de Lorenzana, is usually counted as the first reduction of the Paraguay missions. Loreto and San Ignacio Miní followed in the Guairá region in 1610.
How many people lived in the Guaraní missions?
Mission censuses record a peak population of around 140,000 people in the early 1730s, spread over about thirty towns. Epidemics, famine and war later reduced the numbers considerably.
What was the Guaraní War?
The Guaraní War of 1754–1756 was the armed resistance of seven mission towns that the 1750 Treaty of Madrid transferred from Spain to Portugal. A combined Spanish and Portuguese army defeated the Guaraní at Caiboaté in February 1756, killing around 1,500 of them.
Why were the Jesuits expelled from the missions?
King Charles III of Spain expelled the Jesuits from all his dominions in 1767, distrusting their wealth, independence and loyalty to the papacy. The order was carried out in the Guaraní missions in 1768, and the towns were handed to civil administrators.
Can you visit the Jesuit missions today?
Yes. The ruins of San Ignacio Miní and other missions in Argentina, São Miguel das Missões in Brazil, and Trinidad and Jesús de Tavarangue in Paraguay are UNESCO World Heritage Sites open to visitors.
Sources and further reading
- Caraman, Philip, The Lost Paradise: The Jesuit Republic in South America (1975)
- Ganson, Barbara, The Guaraní under Spanish Rule in the Río de la Plata (2003)
- UNESCO World Heritage List, "Jesuit Missions of the Guaranis" and "Jesuit Missions of La Santísima Trinidad de Paraná and Jesús de Tavarangue"
- Encyclopaedia Britannica, "Reduction"
Cite this article
“Jesuit Reductions of Paraguay (1609): Missions of the Guaraní.” Chronicle, https://chronicle.bigworldlist.com/articles/jesuit-reductions-of-paraguay-1609/.