Slavery, Women and the Limits of Aristotle

Even great thinkers can share the prejudices of their age, and Aristotle is a clear example. In Politics Book 1 he argued that some people are 'slaves by nature', lacking the capacity for full deliberation and benefiting from being ruled, though he admitted that many people enslaved by war were not natural slaves. He also claimed women's deliberative capacity lacked authority, so men should rule households.

These arguments were later used to justify slavery and inequality, including in the 1550 Valladolid debate over Indigenous peoples in the Americas. Historians explain that Aristotle was rationalizing institutions his society depended on, yet some contemporaries, according to Aristotle himself, argued that slavery was merely conventional and unjust. Studying these views teaches an important skill: separating the lasting value of a thinker's methods and insights from claims that reflect bias, and asking how evidence was used or ignored.