The slave ship Duchesse de Grammont left the African coast carrying enslaved Africans toward Haiti. About 522 people had been taken aboard.

Vessel: Duchesse de Grammont; flag: France; estimated standardized tonnage: 329.3. People recorded in connection with the voyage: Investor: Exaudy de Kerbigaut; Captain: Mesnard, P. The voyage began at Nantes on 23 July 1765. Principal recorded place where captives were acquired: West Central Africa and St Helena, port unspecified. Principal recorded disembarkation place: Cap Français. Recorded duration of the captives' Atlantic crossing: 50 days. Estimated mortality during the crossing: 13.0%. Recorded outcome: Voyage completed as intended.