The slave ship Quatro de Março arrived with enslaved Africans in Brazil. About 1050 people had been taken aboard and approximately 950 arrived.

Vessel: Quatro de Março; flag: Portugal / Brazil; rig: Barque; estimated standardized tonnage: 245. People recorded in connection with the voyage: Captain: Rêgo, J J do. The voyage began at Rio de Janeiro on 8 April 1837. Principal recorded place where captives were acquired: Quilimane (East Africa and Indian Ocean islands). Principal recorded disembarkation place: Rio de Janeiro province. Estimated mortality during the crossing: 10.0%. Recorded outcome: Voyage completed as intended.