The history of the relationships intertwined by the Taizé Community amongst Christians of Eastern European countries in the second half of the last century has not yet been written. Yet it is a fundamental chapter for understanding the unique international irradiation of the community. The encounter with the different faces of a Christian youth beyond the Iron Curtain who in Taizé experienced an European space at once unified, will become in particular one of the main directions of investment of the community from the early 1960s. It is on this story that the contributions of this volume intend to throw a first light, relying on a completely unpublished documentation and on the witnesses of many protagonists involved in the construction of this unique continental and ecumenical network.