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: Captain: Ferreira, João Antônio; Investor: Ferreira, João Antônio; Investor: Guimarães, José Joaquim; Captain: Salazar, José Pereira. The voyage began at Rio de Janeiro on 24 August 1821. Principal recorded place where captives were acquired: Cabinda (West Central Africa and St Helena). Principal recorded disembarkation place: Rio de Janeiro. Recorded duration of the captives' Atlantic crossing: 54 days. Estimated mortality during the crossing: 6.0%. Recorded outcome: Voyage completed as intended.