Oriental Province

Banda Oriental, or more fully Banda Oriental del Uruguay (Eastern Bank [of the River Uruguay]), was the name of the South American territories east of the Uruguay River and north of Río de la Plata, comprising the modern nation of Uruguay, the modern Brazilian State of Rio Grande do Sul and some parts of Santa Catarina. It was the easternmost territory of the Viceroyalty of the Río de la Plata.

After decades of disputes over these territories, the 1777 First Treaty of San Ildefonso settled the division between the Spanish Empire and the Portuguese Empire: the southern part was to be held by the Spanish Viceroyalty of the Río de la Plata and the northern territories by the Portuguese Capitania de São Pedro do Rio Grande do Sul (English: Captaincy of Saint Peter of the Southern Río Grande).

The Banda Oriental was not a separate administrative unit until the de facto creation of the Provincia Oriental (English: Eastern Province) by José Gervasio Artigas in 1813 and the subsequent decree of the Supreme Director of the United Provinces of the Río de la Plata of 7 March 1814, which formally established the Gobernación Intendencia Oriental del Río de la Plata (English: Governorship-Intendency East of the Río de la Plata), making it a constituent part of the United Provinces of South America.

Before the arrival of the Spanish and the Portuguese, several tribes of indigenous people were living in this area as nomads. The principal ones were the Charrúas, the Chanás, the Guayanas and the Guaraníes. Juan Díaz de Solís discovered this territory in 1516. During the conquest of the Río de la Plata area by the "Adelantados" (1535–1590), the main concern was to reach the interior in search of precious metals, so this region remained mostly ignored. The first ephemeral Spanish attempts to start populated centres in this territory happened between 1527 and 1577. These were the Fortín de San Lázaro (actual Carmelo) and the Puerto de San Salvador (1527–1530) by Sebastián Gaboto, the Real de San Juan (1542–1553) and the Real de San Gabriel y Ciudad de San Salvador (1573–1577) by Juan Ortiz de Zárate.

...
Wikipedia