Published European first-hand accounts of the coastlands from Senegal to Angola for the period c. 1445-c. 1700 are examined to see what light they throw on the extent to which institutions of servitude in pre-colonial sub-Saharan Africa were autonomous developments or a response to external demands for African slaves. It seems clear that when, in the early years of this period, European traders first approached societies along the western African coasts, they were commonly offered what they called ‘slaves’ in exchange for the goods they had brought. But it would be wrong to conclude from this that a slave class was necessarily a feature of western African coastal societies when these were first contacted by Europeans. It is clear, for instance, that the Europeans preferred to deal with societies which had developed monarchical governments, whose leaders had control of sufficient surpluses to make trade worthwhile. The evidence suggests that in these societies most individuals were dependants of a ruling and entrepreneurial elite, but that there was also social mobility. A category of dependants that particularly attracted the notice of the European observers was women, whom men of power and wealth tended to accumulate as wives (and hence as the potential mothers of still more dependants). The necessarily limited supply of women may have been a factor encouraging such men to seek to increase their followings, and thus their status, power and wealth, by recruiting other dependants by forcible, judicial and economic means. While many such dependants, or their offspring, would be assimilated into the social groups commanded by their masters, the latter were certainly willing to contemplate using recently acquired or refractory recruits in other ways, such as exchanging them for alternative forms of wealth.