Abstract Drawing on merchant letters and account books of military entrepreneurs, whose role in slave markets is still poorly understood, this article explores the Mediterranean activities of the Genoese contractors who emerged as major slave traffickers while operating galleys for the Spanish Monarchy. By examining their operations as slave buyers rather than as slave makers, this study analyzes how and why early modern military entrepreneurs mobilized forced labor beyond national borders. The article shows that in the specific context of the early 17th century, Genoese galley managers obtained most slaves by buying them in distant Mediterranean ports, and the reasons for this are explained. The study of how slaves were located, evaluated, negotiated over, paid for, and transported from a distance reveals that buying slaves internationally involved connecting the distant ports of a fragmented market characterized by a volatile local supply, localized information, unpredictable prices, and ubiquitous brokers. It is argued that, in such an imperfect market, the asentistas de galeras had no choice but to empower their galley captains and local agents. Purchasing slaves overseas increased market opportunities but involved high risks, unpredictable legal procedures, and myriad logistical issues.
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