Alegrete in the context of "Ragamuffin War"

The Riograndense Republic, often called the Piratini Republic (Portuguese: República Rio-Grandense or República do Piratini), was a de facto state that seceded from the Empire of Brazil and roughly coincided with the present state of Rio Grande do Sul. It was proclaimed on 11 September 1836 by general Antônio de Sousa Neto as a direct consequence of the victory obtained by gaúcho oligarchic forces at the Battle of Seival [pt] (1836) during the Ragamuffin War (1835–1845). It had a constitution adopted in 1843 and was recognised only by the United Kingdom, France, and Uruguay.

In 1839, the Riograndense Republic formed a confederation with the short-lived Juliana Republic (Portuguese: República Juliana) which proclaimed its independence in the same year. November 1839, however, saw the war result in the defeat and disappearance of the Juliana Republic. The Riograndense Republic had five capitals during its nearly nine years of existence: the cities of Piratini (for which it is often called Piratini Republic), Alegrete, Caçapava do Sul (official capitals), Bagé (for only two weeks), and São Borja. The war between the Gaúchos and the Brazilian Empire was ended by the Ponche Verde Treaty.