Johannes Musaeus (7 February 1613 – 4 May 1681) was a German Protestant theologian.

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Quick Facts Born, Died ...

Johannes Musaeus
Born	7 February 1613 Langewiesen, Schwarzburg-Sondershausen
Died	4 May 1681 Jena, Saxe-Jena
Nationality	German
Alma mater	University of Erfurt
Scientific career
Fields	Theologian and natural philosopher
Institutions	University of Jena
Doctoral advisor	Georg Grosshain
Doctoral students	Johann Georg Macasius
Notes
He was the brother of Peter Musaeus.

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After visiting the Latin school in Arnstadt he studied at the University of Erfurt starting from 1633 in the Arts Faculty and in Jena with Damiel Stahl. In 1634 he received the Magister Artium, studying theology under Georg Grosshain, producing a thesis entitled: Disputatio Apologetica In qua Germanica B. Lutheri versio adversus Georgium Holzaium Jesuitam Ingolstad. defenditur In causa De Cultu Divino Enoschi. In 1643 he became professor of history and poetry. He obtained a doctorate to 1646 in theology and changed to the Theological Faculty.

He fought against the catholic controversial theologians V. Erbermann, J. Kedde, and Jacobus Masenius, and positioned himself against Socinianism. He was founder of the Jenenser Richtung followed by orthodox Lutherans.

• Disquisitio philologica de stylo Novi Testamenti, 1641, Jena
• De usu principiorum rationis et philosophiae in controversiis theologicis libri III, 1644, Jena
• Disputatio de aeterno dei decreto an absolutum sit, 1646, Jena
• Verteidigung des unbeweglichen Grundes, dessen der Augsburgischen Confession verwandte Lehrer zum Beweis ihrer Kirchen sich gebrauchen, 1654, Jena
• Tractatus theologicus de conversione hominis peccatoris ad Deum, 1661, Jena
• Biblia Lutheri auspiciis Ernesti Ducis. .. glossis ac interpretationibus illustrata, a Viti Erbermanni iterata maledicentia vindicata, 1663, Jena

• Syncretistic controversy
• Georg Calixt
• Abraham Calov

• Carl Stange: Zur Theologie des Musäus, 1897
• Otto Ritschl: Dogmengeschichte des Protestantismus IV, 1927
• Hans Leube: Kalvinismus und Luthertum I, 1928, 347 ff.

• Musaeus' math genealogy
• Johannes Musaeus in the German National Library catalogue
• "Johannes Musaeus". Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German).
• Union, Konversion, Toleranz: Kolloquium im Institut für Europäische Geschichte vom 24. - 27. Februar 1999