In 2017, the fifth centenary of the Reformation is taking place. It is different from the four previous centenaries in several key respects. One of the foremost differences will be the fact that this one will, for the first time, take place in an ecumenical age. This creates the expectation that Protestants, differently from former times, will commemorate not only among themselves but also together with the Catholics with whom they have been in dialogue for half a century. But how can this even be possible, judging by the previous centenaries so dominated by confessional conflicts? This question is discussed by analyzing the document of the Lutheran/Roman Catholic Commission on Unity, From Conflict to Communion (Evangelisches Verlaganstalt, 2013).