Book excerpt: Observers and historians continue to marvel at the diversity and complexity of the Ottoman Empire. This book explores the significant and multifaceted role that Orthodox Christian networks played in the sultan’s realm from the 17th century until WWI. These multi-ethnic, multi-lingual, and multi-confessional formations contributed fundamentally to the political, economic, social, and cultural development of the Empire as well as to its gradual disintegration. Bringing together scholars from most Balkan countries, Christian Networks in the Ottoman Empire describes the variety of Orthodox Christian networks under Ottoman rule. The examples examined include commercial relations, intellectual networks, educational systems, religious dynamics, consular activities, and revolutionary movements, and involve Muslims and Christians, Romanians and Serbs, Bulgarians and Greeks, Albanians and Turks. The contributions show that the Christian populations and their elites were an integral part of Ottoman society. The geographical spread of the formal and informal networks enriches our understanding of the terms ‘center’ and ‘periphery.’ They were either centered within the official Ottoman borders and extended their activities to other states and empires, or vice versa, located elsewhere, but also active in the Ottoman Empire. A common feature of these formations is their constant fluctuation, which enables a dynamic understanding of Ottoman history.