The Concord of Leuenberg
The signing in 1973 of the Concord of Leuenberg, a small Swiss city, was the result of discussions begun in 1960 between ministers and heads of Lutheran and Reformed Churches in Europe. It was recognized that the doctrinal differences of the 16th century between Lutheranism and Calvinism concerning Last Supper were obsolete and were no longer a valid reason for dividing the two churches. The Leuenberg Concord made the creation of the United Protestant Church of France possible in 2013.
Article : French Reformed Church