July 5, 1439: Greek Orthodox and Roman Catholics sign the Decree of Union at the Council of Florence, creating an official union between the two churches. Popular sentiment in Constantinople opposed the decree, and when the Turks captured the city, the union ceased. However, the council's definition of doctrine and its principles of church union (unity of faith, diversity of rite) have proved useful in subsequent church talks (see issue 54: Eastern Orthodoxy).

July 5, 1962: H. Richard Niebuhr, ...