Preliminary Peace Convention (1828)

Treaty of Montevideo

Type	Bilateral treaty
Signed	27 August 1828 (1828-08-27)
Location	Rio de Janeiro, Empire of Brazil
Ratified	29 August 1828 (1828-08-29) by United Provinces of the Río de la Plata 30 August 1828 (1828-08-30) by Empire of Brazil
Effective	8 October 1828 (1828-10-08)
Condition	Exchange of ratifications took place on 4 October 1828 in Montevideo
Mediators	John Ponsonby
Original signatories	Juan Ramón Balcarce Tomás Guido Marquis of Aracati José Clemente Pereira Joaquim de Oliveira Álvares
Parties	United Provinces of the Río de la Plata Empire of Brazil United Kingdom of Great Britain and Ireland
Ratifiers	Pedro I, Emperor of Brazil Manuel Dorrego, Governor of Buenos Aires

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The Preliminary Peace Convention was a bilateral treaty signed on 27 August 1828 between the Empire of Brazil and the United Provinces of the Río de la Plata, after British mediation, that put an end to the Cisplatine War and recognized the independence of Uruguay.

Called the Preliminary Peace Convention as a result of the meetings held by representatives from the Empire of Brazil and the United Provinces — the predecessor state for Argentina — between 11 and 27 August 1828 in Rio de Janeiro, Brazil. This convention, or treaty, accorded independence to Uruguay in respect to Brazil and Argentina. Uruguay's independence would be definitively sealed on 4 October of the same year when, in Montevideo, the signing nations ratified the treaty.