The slave ship Maria Leonor arrived with enslaved Africans in Brazil. About 221 people had been taken aboard and approximately 180 arrived.

Vessel: Maria Leonor; flag: Portugal / Brazil; rig: Bergantim. People recorded in connection with the voyage: Captain: Espírito Santo, Manoel Pereira do; Captain: Pereira, José Antônio; Investor: Pereira, José Antônio; Investor: Abreu, Joao Viegas de; Captain: Gonçalves, Francisco. The voyage began at Lisbon on 4 March 1804. Principal recorded place where captives were acquired: Gabon (Bight of Biafra and Gulf of Guinea islands). Principal recorded disembarkation place: Pernambuco, place unspecified. Estimated mortality during the crossing: 19.0%. Recorded resistance: Vessel's boats attacked from shore.