The article tries to find a possible model of role that the papal office can play for ec-umenical dialogue. First, the author reviews opinions about the pope and his office issued by the Evangelical Church in the 16th century, especially in Martin Luther’s theology. In the second step, there is an analysis of the ‘pope’ understanding presented by the modern Polish Lutheran theology. According to the applied method of “unity in reconciled diversity” it seems that the pope, as a head of the Roman Catholic Church could be understood as primus inter pares. The article develops the possible consequence of this papal duty in the vision of the ecumenical Pentarchy. It would be an ecumenical collaboration between the 5 biggest traditions of the modern Christianity: Roman Catholicism, Orthodoxy, Eastern Pre-Chalcedonian Churches, Anglicanism and Lutheran Protestantism. This model does not mean a way to the institutional primacy of the Bishop of Rome.