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

Vessel: Mariana Dáfne; flag: Portugal / Brazil; rig: Bergantim. People recorded in connection with the voyage: Investor: Macedo, Diogo Teixeira de; Captain: Branco, Antônio Rodrigues. The voyage began at Rio de Janeiro on 4 December 1820. Principal recorded place where captives were acquired: Luanda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 35 days. Estimated mortality during the crossing: 4.0%. Recorded outcome: Voyage completed as intended.