Agreement between the Roman Catholic Church and a secular power. One of the most important was the Concordat of 1801 between Pius VII and Napoleon I which re-established the Catholic Church in France. Another concordat, in the form of the Lateran Treaties of 1929, regulated the status of the papacy in Italy, which had been a source of contention since the temporal power of the pope was abolished by unification in 1870. It gave the pope sovereignty over Vatican City and restored the influence of the Catholic Church in Italy.