The slave ship Prince Grasse left the African coast carrying enslaved Africans toward Puerto Rico. About 415 people had been taken aboard.

Vessel: Prince Grasse; flag: France; estimated standardized tonnage: 281.3. People recorded in connection with the voyage: Investor: Deguer, Fr; Captain: Duroché Soret. The voyage began at Nantes on 25 September 1768. Principal recorded place where captives were acquired: Loango (West Central Africa and St Helena). Principal recorded disembarkation place: Puerto Rico, port unspecified. Recorded duration of the captives' Atlantic crossing: 60 days. Estimated mortality during the crossing: 5.0%. Recorded outcome: Voyage completed as intended.