Map - Marechal Deodoro (Marechal Deodoro)

Manuel Deodoro da Fonseca (5 August 1827 – 23 August 1892) was a Brazilian politician and military officer who served as the first president of Brazil. He was born in Alagoas in a military family, followed a military career, and became a national figure. Fonseca took office as provisional president after heading a military coup that deposed Emperor Pedro II and established the First Brazilian Republic in 1889, disestablishing the Empire. After his election in 1891, he stepped down the same year under great political pressure when he dissolved the National Congress. He died less than a year later.

Fonseca was born the third child of a large military family on 5 August 1827 in Alagoas da Lagoa do Sul, Alagoas, a town that now bears his name as Marechal Deodoro, in Northeast Brazil. He was the son of Manuel Mendes da Fonseca Galvão (1785–1859) and his wife, Rosa Maria Paulina de Barros Cavalcanti (1802–1873). During the Brazilian Empire, his older brother, Severino Martins da Fonseca, was nominated the first Baron of Alagoas. Another notable relative was the Portuguese humanist Francisco de Holanda (d. 1585), his remote uncle. Fonseca pursued a military career that was notable for his suppression of the Praieira revolt in Pernambuco in 1848, Brazil's response to that year's revolutions in Europe. He also saw action during the Paraguayan War (1864–1870), attaining the rank of captain. In 1884 he was promoted to the rank of field marshal, and he later achieved the rank of full marshal. His personal courage, military competence, and manly personal style made him a national figure.