The slave ship S João Nepomuceno arrived with enslaved Africans in Brazil. About 538 people had been taken aboard and approximately 490 arrived.

Vessel: S João Nepomuceno; flag: Portugal / Brazil; rig: Curveta; estimated standardized tonnage: 30. People recorded in connection with the voyage: Captain: Garcia, Francisco Correa; Captain: Firme, Manoel Caetano. The voyage began at Rio de Janeiro on 1799. Principal recorded place where captives were acquired: Luanda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Estimated mortality during the crossing: 9.0%. Recorded outcome: Voyage completed as intended.