This book comprises twenty-one selected papers from the Fourth Congress of the international scholarly Society of Oriental Liturgy, held at the Universities of Notre Dame and Balamand in Lebanon, July 2012. These articles reflect studies on Coptic, Ethiopian and Eritrean, Syriac, Greek-Byzantine, Slavonic, etc. liturgies. The authors examine, inter alia, the rites of matrimony, the blessing of the waters, and the Eucharistic Prothesis; developments in Christian iconography; early Christian worship and liturgical theology; new methodological approaches. The papers discuss both the historical practice of diverse Eastern Churches and the current situation. Thus this collection of articles shows clearly the progress made in a fascinating field of research.