Book excerpt: The historical horse is at once material and abstract, as is the notion of the border. Borders and frontiers are not only markers delineating geographical spaces but also mental constructs: there are borders between order and disorder, between what is permitted and what is prohibited. Boundaries and liminal spaces also exist in the material, economic, political, moral, legal and religious spheres. In this volume, the contributing authors explore the theme of the liminality of the horse in all of these historical arenas, asking how does one reconcile the very different roles played by the horse in human history?