The slave ship Duchesse de Grammont left the African coast carrying enslaved Africans toward Haiti. About 519 people had been taken aboard.

Vessel: Duchesse de Grammont; flag: France; estimated standardized tonnage: 329.3. People recorded in connection with the voyage: Captain: Exaudy; Investor: Exaudy; Investor: Lepot; Captain: Mesnard, Pierre. The voyage began at Nantes on 23 October 1771. Principal recorded place where captives were acquired: Loango (West Central Africa and St Helena). Principal recorded disembarkation place: Cap Français. Recorded duration of the captives' Atlantic crossing: 53 days. Estimated mortality during the crossing: 23.0%. Recorded outcome: Voyage completed as intended.