The profound emotion felt around the world upon seeing images of Notre-Dame in flames opens up a series of questions: Why was everyone so deeply moved? Why does Notre-Dame so clearly crystallise what our civilisation is about? What makes ‘Our Lady of Paris’ the soul of a nation and a symbol of human achievement? What is it that speaks so directly to us today? In answer, Agnès Poirier turns to the defining moments in Notre-Dame’s history.