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Britannica Sources used in this answer

When was Buenos Aires first founded by Pedro de Mendoza?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Political map of Argentina showing provincial boundaries, major cities, and neighboring countries including Chile, Bolivia, Paraguay, Brazil, and Uruguay. The map highlights Argentina's extensive Atlantic coastline, the Andes mountain border with Chile, and includes the disputed Falkland Islands (Islas Malvinas) in the South Atlantic. An inset shows Argentina's location within South America.
History of Argentina

Pedro de Mendoza first founded Buenos Aires in 1536.123

He named the settlement Nuestra Señora Santa María del Buen Aire ("Our Lady St. Mary of the Good Air"). However, the settlement struggled due to deficient supplies and attacks by local Indigenous people, leading the remaining inhabitants to abandon the site in 1541 and move to Asunción. The city was later refounded in 1580 by Juan de Garay.312