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

Vessel: Hércules; flag: Portugal / Brazil; rig: Brig. People recorded in connection with the voyage: Captain: Viana, José Joaquim; Investor: Viana, José Joaquim; Investor: Viana, Francisco José Joaquim. The voyage began at Bahia, place unspecified on 5 March 1806. Principal recorded place where captives were acquired: Costa da Mina, place unspecified (Bight of Benin). Principal recorded disembarkation place: Bahia, place unspecified. Recorded duration of the captives' Atlantic crossing: 52 days. Estimated mortality during the crossing: 5.0%. Recorded outcome: Voyage completed as intended.