Caspar Olevian (or Kaspar Olevianus; 10 August 1536 – 15 March 1587) was a significant German Reformed theologian during the Protestant Reformation and along with Zacharius Ursinus was said to be co-author of the Heidelberg Catechism. That theory of authorship has been questioned by some modern scholarship.
Born in Trier, Olevian was the son of a baker and attended a course of humanist studies in Paris. He went on to study law at Bourges and came under the influence of Reformation teaching. On his return to Trier his beliefs came into conflict with those of the local clergy.
In 1560 he was invited by Frederick III, Elector Palatine to teach at the University of Heidelberg. After the Elector's death his son Louis VI, Elector Palatine, who was strongly Lutheran in conviction, attempted to turn the school away from the Reformed doctrine of the Heidelberg catechism. Olevianus was banned from teaching but he was able to move to Berleburg. There, in 1578, he published a commentary on the Epistle to the Galatians, with a preface by Theodore Beza.
Olevianus published several works on the Covenant of Grace. In 1584 he moved to the County of Nassau and became rector of Herborn Academy. He died in 1587 surrounded by friends and supporters and was buried in Herborn. On his deathbed he was asked "Are you undoubtedly sure of your salvation, as you taught others constantly?" His reply was "Most certain!"
- Bierma, Lyle (2005). "The Purpose and Authorship of the Heidelberg Catechism". An Introduction to the Heidelberg Catechism: Sources, History, and Theology. Grand Rapids: Baker. p. 67. ISBN 0-80103117-6.
- Goeters, J. F. Gerhard (2006) . "Zur Geschichte des Katechismus". Heidelberger Katechismus [Heidelberg catechism] (in German) (revised, 3rd ed.). Neukirchen-Vluyn: Neukirchener. p. 89. ISBN 378871570-7.
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- Rev. John M'Clintock, D.D.; James Strong, S.T.D. (1877). "Olevianus, Caspar (1536-1587)". Cyclopaedia of Biblical, Theological, and Ecclesiastical Literature. Vol. VII. New York: Harper & Brothers. pp. 343–344. Archived from the original on 2015-09-23. Retrieved 2008-11-09.
- Works by or about Caspar Olevian at Internet Archive
- Works by Caspar Olevian at LibriVox (public domain audiobooks)
- Literature by and about Caspar Olevian in the German National Library catalogue
- Works by and about Caspar Olevian in the Deutsche Digitale Bibliothek (German Digital Library)
- Webseite of the Caspar Olevian Society, Trier
- "Kaspar Olevianus" in the Ecumenical Lexicon of Saints
- Olevian in the Glaubenzeugen Calendar