Joaquim Egydio de Souza Aranha, Marquis of Três Rios (19 March 1821 – 19 May 1893) was a Brazilian nobleman, landowner, banker, and politician.
A prominent figure of the Liberal Party, he served three terms as a municipal councilor in Campinas.ALMANACH PAULISTA PARA O ANNO DE 1882. São Paulo: G. Rangel, 1881. As a financier, he invested heavily in the Companhia Paulista de Estradas de Ferro and participated in the establishment of the . Additionally, he was a benefactor of the , and helped found the traditional Colégio Culto à Ciência.
Aranha's manor housed the Polytechnic School of São Paulo for several years, until it was severely damaged in bombardments during the São Paulo Revolt of 1924.
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