José Francisco de San Martín y Matorras, known simply as José de San Martín or the Liberator of Argentina, Chile and Peru, was an Argentine general and the primary leader of the southern and central parts of South America's successful struggle for independence from the Spanish Empire who served as the Protector of Peru. Born in Yapeyú, Corrientes, in modern-day Argentina, he left the Viceroyalty of the Río de la Plata at the early age of seven to study in Málaga, Spain.
In 1808, after taking part in the Peninsular War against France, San Martín contacted in London South American supporters of independence from Spain. In 1812, he set sail for Buenos Aires and offered his services to the United Provinces of the Río de la Plata, present-day Argentina.
Wikipedia https://en.wikipedia.org/wiki/José_de_San_Martín
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