The slave ship Quatro de Agosto arrived with enslaved Africans in Brazil. About 304 people had been taken aboard and approximately 295 arrived.

Vessel: Quatro de Agosto; flag: Portugal / Brazil; rig: Brig; estimated standardized tonnage: 107. People recorded in connection with the voyage: Investor: Silva, Antonio da; Captain: Moura, Félix José. The voyage began at Pernambuco, place unspecified. Principal recorded place where captives were acquired: Luanda (West Central Africa and St Helena). Principal recorded disembarkation place: Pernambuco, place unspecified. Recorded duration of the captives' Atlantic crossing: 22 days. Estimated mortality during the crossing: 3.0%.