According to P.W. Brown the use of the term "concordat" does not appear "until the pontificate of Pope Martin V (1413–1431) in a work by Nicholas de Cusa, entitled "De Concordantia Catholica"". The first concordat dates from 1098, and from then to the beginning of the First World War the Holy See signed 74 concordats. Due to the substantial remapping of Europe that took place after the war, new concordats with legal successor states were necessary. The post-World War I era saw the greatest proliferation of concordats in history.