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

Vessel: Grão Penedo; flag: Portugal / Brazil; rig: Bergantim. People recorded in connection with the voyage: Investor: Rocha, José Francisco Ferreira da; Captain: Oliveira, Sérgio Ferreira de. The voyage began at Rio de Janeiro on 4 August 1820. Principal recorded place where captives were acquired: Quilimane (East Africa and Indian Ocean islands). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 58 days. Estimated mortality during the crossing: 25.0%. Recorded outcome: Voyage completed as intended.