Publicity was once the exclusive property of men of rank. They alone, by virtue of their stations, could make things public. During the 18th century it became meaningful to talk about "public opinion" as something formed outside the state. Today anyone with a Twitter account can make a public. In this series IDEAS producer David Cayley examines how publics were formed in Europe, between 1500 and 1700, and how these early publics grew into the concept of "the public" that we hold today.