This book examines the difficult relationship between individual intellectual freedom and the legal structures which govern human societies in William Blake works, showing that this tension carries a political urgency that has not yet been recognised by scholars in the field. In doing so, it offers a new approach to Blake corpus that builds on the literary and cultural historical work of recent decades. Blake pronouncements about law may often sound biblical in tone; but this book argues that they directly address (and are informed by) eighteenth-century legal debates concerning the origin of the English common law, the autonomy of the judicature, the increasing legislative role of Parliament, and the emergence of the notions of constitutionalism and natural rights. Through a study of his illuminated books, manuscript works, notebook drafts and annotations, this study considers Blake understanding that law is both integral to humanity itself and a core component of its potential fulfilment of the ‘Human Form Divine’.