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Gnesio-Lutherans (from Greek γνήσιος [gnesios]: genuine, authentic) is a modern name for a theological party in the Lutheran churches, 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' view of original sin, rejected by the Formula of Concord. In a broader meaning, the term "Gnesio-Lutheran" is associated mostly with the defence of the doctrine of Real Presence.