The slave ship Quatro de Abril arrived with enslaved Africans in Brazil. About 362 people had been taken aboard and approximately 342 arrived.

Vessel: Quatro de Abril; flag: Portugal / Brazil; rig: Ship. People recorded in connection with the voyage: Captain: Silva, Joaquim Rodrigues da; Investor: Almeida, Joaquim Pereira de. The voyage began at Rio de Janeiro on 30 April 1820. Principal recorded place where captives were acquired: Cabinda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 37 days. Estimated mortality during the crossing: 6.0%. Recorded outcome: Voyage completed as intended.