"Gnesio-Lutherans" (from Greek γνήσιος [gnesios]: genuine, authentic) is a modern name for a theological party in the Lutheran Church, in opposition to the Philippists after the death of Martin Luther and before the Formula of Concord. In their own day they were called Flacians by their opponents and simply Lutherans by themselves. Later Flacian became to mean an adherent of Matthias Flacius' extreme view of original sin, rejected by the Formula of Concord. In a broader meaning, the term Gnesio-Lutheran is associated mostly with the defense of the doctrine of Real Presence.
After the death of Luther, many theological controversies arose among the Lutherans, mostly due to teaching of Philip Melanchthon. Gnesio-Lutherans were profiled by defending Martin Luther's doctrine, in the beginning led by Matthias Flacius. The Gnesio-Lutherans exercised strict doctrinal discipline, but they also opposed with equal determination what they considered to be the errors of their fellow-combatants like von Amsdorf (Amsdorfians), Flacius (Flacians), Poach, and others. The centres of Gnesio-Lutherans were Magdeburg and the University of Jena.
Gnesio-Lutherans were involved in:
Other Gnesio-Luherans were Caspar Aquila, Joachim Westphal, Johann Wigand, Matthäus Judex, Joachim Mörlin, Tilemann Heshusius, Johann Timann, Simon Musaeus, Erasmus Sarcerius, and Aegidius Hunnius.