Pueyrredón, Juan Martín de [key], 1776–1850, Argentine general, supreme director of the United Provinces of La Plata (1816–19). In 1806, when British troops under William Carr Beresford invaded the Río de la Plata, he organized a volunteer force, which, after a defeat outside Buenos Aires, united with the army of Liniers to recapture the city (Aug. 12). Taking an important part in the revolutionary government, he was governor of Córdoba (1810) and of Charcas (1810–11), commander of the patriot Army of the North (1811–12), and a member of the triumvirate at Buenos Aires (1812). As supreme director, he assisted San Martín in the Chilean campaign of 1817–18. In 1819 congress promulgated a unitarian constitution, which was rejected by the people. The demand for federalism brought Pueyrredón's resignation. His success in preventing anarchy was transient; the civil war of 1820 followed.
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