Christopher Wren (1632-1723) was the greatest architect Britain has ever known. But more than that - he was a founder of the Royal Society, he mapped the moon and the stars, investigated the problem of longitude and the rings of Saturn, and carried out groundbreaking experiments into the circulation of the blood. Adrian Tinniswood also shows us the man behind the legend - married and widowed twice - scrambling over building sites, going to the theatre and drinking in coffee-houses. And he shows clearly why Wren remains a cultural icon as both a creation and a creator of the world he lived in.