This article is dedicated to a topic that has been largely neglected in the historiography of philosophy to date: the position of philosophers towards the institution of slavery. Especially in survey works on the history of philosophy, positions on slavery and colonial conquest are not addressed, but have so far only been discussed in a few individual studies. From the beginning of European expansion, however, philosophical and political theories no longer emerged independently of these developments, as the expansion forced reflection (...) on how to deal with the conquered regions and peoples, and thus on the problematic sides of the ‘voyages of discovery’: land grabbing, subjugation and slavery. Such entanglements are briefly explained using John Locke as an example. In view of the “colonial ensnarement of the Enlightenment” (Elberfeld) and the need for a critical examination of it, I propose as a methodological approach to include texts by thinkers of African origin, who had first-hand experiences of the institution of slavery and critically reflected on their own social position, the social and political conditions of their time as well as moral questions. Using three selected Black thinkers, the poet Phillis Wheatley (1753–1784), the abolitionist Olaudah Equiano (1745–1797) and the theologian Jacobus Elisa Johannes Capitein (ca. 1717–1747), I discuss the relevance of texts by former slaves for the historiography of philosophy. (shrink)