It was the first time that Leibniz's ecumenical ideas had been discussed in an international conference. The main intentions of this event were an analysis of the texts which give a new insight into the specific Leibnizian ecumenical methods in the context of the negotium irenicum between Lutherans and Calvinists 1697 ff. (see Vorausedition of A IV,7) on the one hand and a survey on references to Leibniz in the catholic theology since the timnes of enlightenment and the question, how far Leibniz's ideas are mirrored in the actual ecumenic discourse.