Democracies are particularly suspicious of charismatic leaders. Yet, paradoxically, the longing for such leaders acquired new importance, and a distinct new shape, during the very same period that witnessed the first stirrings of modern democracy: the eighteenth and early nineteenth centuries. It was during the moment of extraordinary intellectual fermentation that we now call the Enlightenment, and then in the great revolutions that washed across much of the Western world between 1775 and the 1820s, that the powerful forms of political charisma we are familiar with today took shape. These forms of charisma posed challenges to democracy but were also symbiotically linked to it. Indeed, from this period onward the stories of charisma and democracy have wound tightly around one another in their own political version of the double helix. They have done so thanks to a revolutionary transformation in the relationship between ordinary people and their political leaders that began in the eighteenth century but that has never been fully understood. That transformation is the subject of this book.