Antipope Felix V
In only eight years, his pontificate delivered important achievements in the political, scientific, and literary history of the world. Politically, he needed to repair relationships which had broken down in the pontificate of Eugene IV. He called the congress which produced the Treaty of Lodi, secured peace with Charles VII of France, and concluded the Concordat of Vienna or "Aschaffenburg" (17 February 1448) with the German King, Frederick III, by which the decrees of the Council of Basel against papal annates and reservations were abrogated so far as Germany was concerned. In the following year he secured a still greater tactical triumph with the resignation of the Antipope Felix V on 7 April and his own recognition by the rump of the Council of Basel that assembled at Lausanne.