The slave ship Cisne departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Brazil.

Vessel: Cisne; flag: Portugal / Brazil; rig: Galera. People recorded in connection with the voyage: Investor: Oliveira, Joaquim José de; Captain: Almeida, Manoel Gomes de. The voyage began at Bahia, place unspecified on 16 August 1821. Principal recorded place where captives were acquired: Malembo (West Central Africa and St Helena). Principal recorded disembarkation place: Bahia, place unspecified. Recorded duration of the captives' Atlantic crossing: 50 days. Estimated mortality during the crossing: 2.0%. Recorded outcome: Voyage completed as intended.