Reading 'Piers Plowman' is an indispensable scholarly guide to a magnificent - and notoriously difficult - medieval poem. With 'Piers Plowman', the fourteenth-century poet William Langland proved that English verse could be at once spiritually electrifying and intellectually rigorous, capable of imagining society in its totality while at the same time exploring heady ideas about language, theology and culture. In her study of Piers Plowman, Emily...