Silvério José Nery was a Brazilian soldier and politician who was a federal deputy from 1897 to 1899, governor of the state of Amazonas from 1900 to 1903 and a senator from 1904 to 1930.

José Plácido de Castro was a Brazilian soldier, surveyor, rubber producer and politician who led the armed revolt during the Acre War of 1902–3, when the Republic of Acre broke away from Bolivia. He was the president of the state of Acre just before and after it was purchased by Brazil. After the war he became extremely wealthy as a rubber producer, and made many enemies. He was assassinated in 1908. He is considered a hero of Brazil.