The slave ship Adamastor left the African coast carrying enslaved Africans toward Brazil. About 530 people had been taken aboard.

Vessel: Adamastor; flag: Portugal / Brazil; rig: Bergantim. People recorded in connection with the voyage: Investor: Rocha, Joaquim José da; Captain: Seixas, Valeriano José de. The voyage began at Rio de Janeiro on 9 May 1818. Principal recorded place where captives were acquired: Benguela (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 33 days. Estimated mortality during the crossing: 6.0%. Recorded outcome: Voyage completed as intended.