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Pedro de Mendoza


Pedro de Mendoza y Lujan , was a Spanish conquistador, soldier and explorer, and the first adelantado of the Rio de la Plata.

Setting sail

Pedro de Mendoza, also known as Don Pedro de Mendoza, was from a noble family in the Andalusian town of Guadix in the province of Granada, high in the favor of Emperor Charles V. He was also a nobleman in the Spanish court. In 1524, he was dubbed a Knight of Alcantara and later received the Order of Santiago.

In 1529, he offered to explore South America at his own expense and establish colonies. Thanks to the efforts of his mother Maria de Mendoza, in 1534, his offer was accepted: he was made adelantado governor, 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 his efforts would be directed towards the Rio de la Plata 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 Osario, was assassinated, according to some authorities by the orders of Mendoza himself because of suspected disloyalty. Mendoza sailed up the Rio de la Plata in 1535 and founded Buenos Aires 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 always suffering from a very bad 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 for the Rio de la Plata

At the River Plate, the Spaniards encountered a group of roughly three thousand natives dispersed throughout the surrounding area known as the Querandis, 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 Querandis 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 Lujan River. The natives were driven off after that bloody battle and their provisions were taken, but the fight was very costly to the Spaniards.

Difficulties that came with colonizing

The colonists' city was surrounded by a hastily made three-feet-thick adobe wall made of mud. Every time it rained it nearly melted away. 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, shoes, 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 Guaranis, made a treaty of friendship with them, and then Ayolas found the city of Asuncion (in Paraguay) in 1537.

Mendoza heads home

While all of this was going on, Mendoza, disappointed and broken in health, embarked for Spain in 1537. Unfortunately, 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 Asuncion. Domingo Martinez de Irala was elected as the third (though temporary) governor by these men. With Buenos Aires in ruins, Asuncion became the base for the reconquest of Argentina.

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Pedro de Mendoza


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