1831 in BrazilEvents in the year 1831 in Brazil.IncumbentsMonarch: Pedro I Pedro IIEventsMarchMarch 13-'15': Night of the Bottle Fight - A street fight between the Portuguese and the Brazilians.MayMay 2: Emperor Pedro I abdicates from his post, leaving the throne for his 5-year-old son Pedro II. Since Pedro II was a minor, the country entered a regency period until he reached the age of 15 in 1840.