This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources. Find sources: "Justus Baronius Calvinus" – news · newspapers · books · scholar · JSTOR (December 2023)

The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "Justus Baronius Calvinus" – news · newspapers · books · scholar · JSTOR (April 2024) (Learn how and when to remove this message)

Justus Baronius Calvinus (c. 1570 - d. after 1606) was a German theologian, a Catholic convert and apologist.

He was born of Calvinist parents and educated at Heidelberg, where he took a course in theology. His study of the Church Fathers inclined him towards Catholicism and finally led him to Rome. There he was kindly received by Cardinal Bellarmine, Cardinal Baronius, and Pope Clement VIII. His gratitude to Baronius caused him to add that cardinal's name to his own.

On his return to Germany, he became a Catholic (1601) and a staunch defender of his faith. In his "Apologia" (Mainz, 1601) he gives the reasons for his conversion and in his "Praescriptionum adversus haereticos ... Tractatus" (ibid. 1602, 1756) he appeals to the Fathers in support of the truth of Catholicism.

Attribution

•  This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Justus Baronius Calvinus". Catholic Encyclopedia. New York: Robert Appleton Company.