The religious ideas associated with Martin Luther, particularly as expressed in the Lesser Catechism (1529) and the Augsburg Confession (1530). A series of internal disagreements within Lutheranism after Luther's death (1546) between hardliners (the so-called "Gnesio-Lutherans" or "Flacianists") and moderates ("Philippists"), led to their resolution by the Formula of Concord (1577), which is usually regarded as the authoritative statement of Lutheran theology.