The slave ship Jonge Willem departed on a transatlantic slave-trading voyage that would carry enslaved Africans to Guyana.

Vessel: Jonge Willem; flag: Netherlands; rig: Fregat; estimated standardized tonnage: 321.1. People recorded in connection with the voyage: Captain: Loef, Cornelis; Investor: Middelburgsche Commercie Compagnie. The voyage began at Zeeland on 25 May 1778. Principal recorded place where captives were acquired: Cape Lahou (Windward Coast). Principal recorded disembarkation place: Essequibo. Estimated mortality during the crossing: 2.0%. Recorded outcome: Voyage completed as intended.