The slave ship Saint Joseph left the African coast carrying enslaved Africans toward Puerto Rico. About 425 people had been taken aboard.

Vessel: Saint Joseph; flag: France; estimated standardized tonnage: 272.3. People recorded in connection with the voyage: Investor: Deguer; Captain: Guyot, Jean. The voyage began at Nantes on 26 May 1770. Principal recorded place where captives were acquired: Calabar (Bight of Biafra and Gulf of Guinea islands). Principal recorded disembarkation place: Puerto Rico, port unspecified. Recorded duration of the captives' Atlantic crossing: 54 days. Estimated mortality during the crossing: 3.0%. Recorded outcome: Voyage completed as intended.