Borno (in northeast Nigeria) is notorious today as the home of an Islamist terrorist group, Boko Haram, whose insurgency is a major security threat, but it was once the heartland of the Kanuri-speaking royal empire of Kanem-Borno, renowned throughout Africa and beyond, which in its later incarnation, the Bornu Empire, lasted from 1380 to 1893. This book offers the reader the first modern history of Borno, drawing upon sources in London, Berlin, Paris, Kaduna and Maiduguri and recently released 'migrated archives'. As its longevity suggests, what is particularly remarkable about Borno is the permanence of its boundaries - its territorial integrity - which dates back centuries, and the political and social identities that such borders framed in the minds of its inhabitants.