The slave ship Saint Guillaume left the African coast carrying enslaved Africans toward Haiti. About 580 people had been taken aboard.

Vessel: Saint Guillaume; flag: France; estimated standardized tonnage: 365.3. People recorded in connection with the voyage: Investor: Bouteiller; Investor: Bouteiller, G; Captain: Beaumont, Fr de. The voyage began at Nantes on 6 March 1770. Principal recorded place where captives were acquired: West Central Africa and St Helena, port unspecified. Principal recorded disembarkation place: Port-au-Prince. Recorded duration of the captives' Atlantic crossing: 49 days. Estimated mortality during the crossing: 9.0%. Recorded outcome: Voyage completed as intended.