Abstract From 1630 until its fall in 1654, the Dutch West India Company maintained a colony in northeastern Brazil where it tried to profit from the cultivation of sugar using enslaved African labor. Count Johan Maurits van Nassau-Siegen served as this colony’s governor-general from 1636 until 1644, this being the most heavily studied period of the colony’s existence. But the role of Johan Maurits in the transatlantic slave trade and enslavement in Brazil is poorly covered by research, with some historians recently arguing that there is ‘no proof’ of any personal involvement. This article presents a clear argument for the personal involvement of Johan Maurits in the slave trade and shows his involvement in slave-smuggling. Understanding the social relations between the count, his court and the Luso-Brazilian elite is in fact simply impossible without bringing in the trade and smuggling of enslaved Africans.