Geoffrey Chaucer is the best-known and most widely read of all medieval British writers, famous for his scurrilous humour and biting satire against the vices and absurdities of his age. Yet he was also a poet of passionate love, sensitive to issues of gender and sexual difference, fascinated by the ideological differences between the pagan past and the Christian present, and a man of science, knowledgeable in astronomy, astrology and alchemy. This...