Pedro de Mendoza () (c. 1487 – June 23, 1537) was a Spanish ''
conquistador
Conquistadors (, ) or conquistadores (; ; ) were Spanish Empire, Spanish and Portuguese Empire, Portuguese colonizers who explored, traded with and colonized parts of the Americas, Africa, Oceania and Asia during the Age of Discovery. Sailing ...
'', soldier and explorer, and the first ''
adelantado
''Adelantado'' (, , ; meaning 'advanced') was a title held by some Spain, Spanish nobles in service of their respective kings during the Middle Ages. It was later used as a military title held by some Spanish ''conquistadores'' of the 15th, 16th a ...
'' of
New Andalusia.
Setting sail
Pedro de Mendoza was born in
Guadix, Grenada, part of a large noble family that was preeminent in Spain. His family settled in Guadix after its
reconquest by the Christians in 1489. He was a page at the Spanish court of
Emperor Charles V
Charles V (24 February 1500 – 21 September 1558) was Holy Roman Emperor and Archduke of Austria from 1519 to 1556, King of Spain (as Charles I) from 1516 to 1556, and Lord of the Netherlands as titular Duke of Burgundy (as Charles II) fr ...
and accompanied the sovereign on his trip to
England
England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
. In 1524 he received the title of knight of the
Order of Alcántara and later, through the influence of his father — the knight Fernando de Mendoza Guadix — entered the
Order of Santiago
The Order of Santiago (; ) is a religious and military order founded in the 12th century. It owes its name to the patron saint of Spain, ''Santiago'' ( St. James the Greater). Its initial objective was to protect the pilgrims on the Way of S ...
. He later fought in the
Italian Wars
The Italian Wars were a series of conflicts fought between 1494 and 1559, mostly in the Italian Peninsula, but later expanding into Flanders, the Rhineland and Mediterranean Sea. The primary belligerents were the House of Valois, Valois kings o ...
against the French, in which he participated in the
Sack of Rome in 1527.
In 1529, he offered to explore South America at his own expense and establish colonies. Thanks to the efforts of his mother,
María de Mendoza, in 1534 his offer was accepted: he was made ''adelantado''
governor
A governor is an politician, administrative leader and head of a polity or Region#Political regions, political region, in some cases, such as governor-general, governors-general, as the head of a state's official representative. Depending on the ...
,
captain general, and
chief justice over
New Andalusia. This grant allowed him authority over as much land as he could conquer, within 200
leagues of the southern limit of
New Toledo. Although this was measured along the Pacific coast, it was understood that his efforts would be directed towards the
Río de la Plata
The Río de la Plata (; ), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda, Colonia, Punta Gorda. It empties into the Atlantic Ocean and ...
on the Atlantic. The Emperor gave Mendoza 2000 men and 13 ships on the condition that within two years Mendoza should transport 1000 colonists, build roads into the interior, and construct three forts. He was to have half the treasure of the
chiefs killed and nine-tenths of the ransom. The office of Governor was also, in theory, made hereditary.
That year, he set sail with a considerable fleet, but a terrible storm scattered it off the coast of Brazil. Here his lieutenant,
Juan de Osorio, was assassinated, according to some authorities by the orders of Mendoza himself because of suspected disloyalty. Mendoza sailed up the Río de la Plata in 1535 and founded
Buenos Aires
Buenos Aires, controlled by the government of the Autonomous City of Buenos Aires, is the Capital city, capital and largest city of Argentina. It is located on the southwest of the Río de la Plata. Buenos Aires is classified as an Alpha− glob ...
on February 2, 1536.
Although Mendoza is said to be the founder of Rio de la Plata (and Buenos Aires), he was not a very effective leader because he was debilitated by a severe case of syphilis. He spent half of his time ill in bed, but he put as much effort as he could into the expedition. No notable campaigns occurred in the River Plate during this time, and the only chronicler was a German soldier named
Ulderico Schmidt (or Ulrico Schmidl). Schmidt came over to the River Plate with Don Pedro and stayed there for eighteen years, fighting in almost every battle. His account of this early history of the River Plate region is the most important document from that time period.
Battling the natives along the Rio de la Plata
At the
Río de la Plata
The Río de la Plata (; ), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda, Colonia, Punta Gorda. It empties into the Atlantic Ocean and ...
, the Spaniards encountered a group of roughly three thousand natives dispersed throughout the surrounding area known as the
Querandíes, who shared with them their food, however scarce. In spite of this, the Spaniards soon took the natives and their generosity for granted and as a result, the Querandíes ended relations with the white men and relocated further away from the Spanish settlement. Angered by the sudden hostility, Mendoza sent his brother to lead a force against the natives.
Even though hundreds of natives were killed, Mendoza's brother was slain as well, along with thirty of his men and several horses at the Battle of the
Luján River. The natives were driven off after that bloody battle and their provisions were taken, but the fight was very costly to the Spaniards.
From "The Devastation of the Indies: A Brief Account" by Bartolomé de las Casas (a Spanish religious), written in 1542, published in 1552, under the subheadings "The Rio de la Plata" wherein de las Casas writes of "A tyrannical Governor", the endnote #48 refers to this person as "a certain Pedro de Mendoza" and goes on to say,
"...ordered some of his men to go to a certain village for food...put to the sword more than 5,000 souls..." Further, another group of "Indians" "As they were killed, they cried out: 'We came in peace to serve you, and you kill us! Our blood spattered on these walls will remain as a witness to our unjust death and to your cruelty!'"
Difficulties

The colonists' city was surrounded by a hastily made thick
adobe
Adobe (from arabic: الطوب Attub ; ) is a building material made from earth and organic materials. is Spanish for mudbrick. In some English-speaking regions of Spanish heritage, such as the Southwestern United States, the term is use ...
wall made of mud. Every time it rained the wall partially dissolved. Along with this occasionally deteriorating wall, the colonists had to deal with another problem: famine. Food eventually became scarce, and the residents had to resort to eating rats, mice, snakes, lizards, rawhide boots, and even the bodies of those who died.
In addition to these difficulties, a coalition of the natives formed. They attacked the city again and again, many times leaving the city almost completely burned to the ground. Still suffering from syphilis, Mendoza appointed
Juan de Ayolas to succeed him as captain-general.
Ayolas dealt with the problem by sailing up the Parana River with a large part of the remaining force. They defeated the
Guaraní, made a treaty of friendship with them, and then Ayolas founded the city of
Asunción
Asunción (, ) is the capital and the largest city of Paraguay. The city stands on the eastern bank of the Paraguay River, almost at the confluence of this river with the Pilcomayo River. The Paraguay River and the Bay of Asunción in the north ...
(in current-day
Paraguay
Paraguay, officially the Republic of Paraguay, is a landlocked country in South America. It is bordered by Argentina to the Argentina–Paraguay border, south and southwest, Brazil to the Brazil–Paraguay border, east and northeast, and Boli ...
) in 1537.
Mendoza heads home
While all of this was going on, Mendoza, disappointed and broken in health, embarked for Spain in 1537. He died during the voyage. He promised to send aid to his forces that he left behind in Buenos Aires. Although he begged Spain to send more men and provisions to save his city in his will, the help that was sent was not sufficient.
In 1541, the settlers abandoned Buenos Aires and moved to Asunción.
Domingo Martínez de Irala was elected as the third (though temporary) governor by these men.
[Crow, John A. "Conquest of the River Plate." ''The Epic of Latin America''. By John A. Crow. 4th ed. New York: University of California P, 1992. 129-30.] With Buenos Aires in ruins, Asunción became the base for the reconquest of the Rio de la Plata region.
References
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{{DEFAULTSORT:Mendoza, Pedro de
Spanish conquistadors
Explorers of Argentina
1480s births
1537 deaths
People from Guadix
Viceroyalty of Peru people
16th-century Spanish explorers