Juan Díaz de Solís (1470 – 20 January 1516) was a 16th-century navigator and explorer. He is also said to be the first European to land on what is now modern day Uruguay.
His origins are disputed. One document records him as a Portuguese in the service of Castile ("Spain"), having possibly been born in Lisbon or São Pedro de Solis. Others claim that his birth took place in Lebrija, in what is now the province of Seville, Spain, where documentation testifies that he lived when he was in Castile, as vecino ("neighbor"), meaning living there. However he began his naval career in Portugal as João Dias de Solis, where he became a pilot in the Portuguese India Armadas. After leaving his home in Lisbon and the ship that he was going to sail as Pilot, in the same day of departure of the fleet (ship captained by Afonso de Albuquerque, in the 1506 armada of Tristão da Cunha, to India), accused of the death of his wife, he served as a privateer in French fleets for a short time, before serving, later, the Spanish Crown.
He served as navigator on expeditions to the Yucatán in 1506-1507 and Brazil in 1508 with Vicente Yáñez Pinzón. He became a Pilot-Major of Spain in 1512 following the death of Amerigo Vespucci, and was thereafter commissioned to update the Padrón Real with Juan Vespucio.
Two years after appointment to this office, Díaz de Solís prepared an expedition to explore the southern part of the new American continent. His three ships and crew of 70 men sailed from Sanlúcar de Barrameda, in Spain, on 8 October 1515. He followed the eastern coast of South America southward as far as the mouth of the Río de la Plata. He reached and named the Río de la Plata in 1516, sailing upriver to the confluence of the Uruguay River Paraná River with two officers and seven men. The little party had not proceeded far when they were attacked by local Charrúa Indians, but the evidence points towards it being the Guarani people who killed him. It has been suggested that he was eaten by the Charrúa after disembarking. However, the Charrúa didn't practice cannibalism, while the Guarani Indians did. Surviving crew members reported Díaz de Solís and most of the other men had been killed, thus putting the expedition to an end. His brother-in-law, Francisco de Torres, took charge of the ships and returned to Spain.
Several places in Uruguay are named after Juan Díaz de Solís:
- bodies of water:
- Arroyo Solís Grande
- Arroyo Solís Chico
- populated places:
- Balneario Solís
- Solís de Mataojo
- Solís Theatre, the most important theatre in Montevideo
- Route 10 Juan Díaz de Solís
- E. Wright (2008) Lost Explorers (p.91)
- Arquivo Nacional da Torre do Tombo, Alguns documentos do Archivo Nacional da Torre do Tombo açerca das navegações e conquistas portuguezas (Lisbon, 1892), pp. 262 – 263. A 1517 decree from the Spanish court also lists Díaz de Solís as a Portuguese. Source: Archivo General de Indias, INDIFERENTE, 419, L.6 ,F.602R-602V, ‘Orden a los oficiales de la Casa de la Contratación’, 21 January 1517.
- Medina, José Toribio: Juan Díaz de Solís. Estudio Histórico, Santiago de Chile : J.T. Medina, 1897
- Brevoort, James Carson (1873). "Notes on Giovanni da Verrazano and on a Planisphere of 1529, Illustrating His American Voyage in 1524, with a Reduced Copy of the Map". pp. 145–297. JSTOR 196400.
- Hall, Elial F.: "Americus Vespucius", Journal of the American Geographical Society of New York, Vol. 24. (1892), page 376. 
- Archivo General de Indias,, "Comisión a Juan Díaz de Solís y Juan Vespucci", ES.41091.AGI/16404.46.5.1//CONTRATACION,5784,L.1,F.20-21.
- Stevenson, Edward L.: "The Geographical Activities of the Casa de la Contratacion", Annals of the Association of American Geographers, Vol. 17, No. 2. (Jun., 1927), pp. 39-59.
- Davies, Arthur :"The First Discovery and Exploration of the Amazon in 1498-99," Transactions and Papers (Institute of British Geographers), No. 22. (1956), pp. 87–96.
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