John Locke wrote the philosophical foundations of liberal democracy — natural rights, government by consent, the right of revolution — ideas that directly shaped the American and French revolutions. But the man behind these ideals was tangled in contradictions: a champion of liberty who invested in the slave trade, a theorist of religious tolerance who excluded Catholics and atheists.

This episode traces Locke's ideas from their origins in English Civil War politics through the Two Treatises of Government, examining how a deeply flawed thinker produced the blueprint that modern democracies still build on — and what his contradictions reveal about the limits of Enlightenment idealism.

• Locke's political education during the English Civil War and Restoration turmoil
• The Two Treatises of Government and their radical argument  ...