In December 1917, British troops entered Jerusalem, thereby ending Ottoman rule and opening a new and important era in the history of Jerusalem. Roberto Mazza discusses the period of transition from Ottoman rule to the British administration, focusing on the socio-political changes from the nineteenth century to the twentieth, the impact of the First World War and the ongoing development of Jerusalem into the vibrant city it has become. He considers the impact of the change in administration on the local population and uses case studies to provide new perspectives on this often overlooked period in Jerusalem's history.