Thomas Erastus

Swiss Calvinist theologian and physician

Seventy-five theses regarding the nature of church discipline and state authority, published posthumously in 1589 under the title Explicatio gravissimae quaestionis, became the intellectual foundation for the political theory of Erastianism. These arguments originated from a physician and theologian who spent his career navigating the volatile intersection of medicine and religious reformation in sixteenth-century Europe.

Medical and Academic Training

Born in 1524 at Baden, Switzerland, originally under the surname Lüber or Lieber, he began theological studies at the University of Basel in 1540. The 1544 plague outbreak necessitated a relocation to Italy, where he attended the University of Bologna and the University of Padua to pursue philosophy and medicine. By 1553, he secured a position as physician to the count of Henneberg in Saxe-Meiningen.

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Tenure at Heidelberg

In 1558, he became physician to the elector-palatine, Otto Heinrich, concurrently serving as a professor of medicine and pharmacology at Heidelberg University. Under the subsequent ruler, Frederick III, he was appointed a privy councillor and a member of the church consistory in 1559. During this period, he engaged in theological debates at Heidelberg and Maulbronn, defending the Zwinglian doctrine of the Lord's Supper against Lutheran counterparts.

Theological Conflict and State Authority

He opposed the implementation of a Presbyterian church model in Heidelberg during 1570, preferring a system where the state held authority over ecclesiastical discipline and the administration of sacraments. This stance, which resulted in his temporary excommunication on charges of Socinianism, informed the arguments in his posthumous publication. He eventually returned to the University of Basel in 1580, serving as a professor of ethics until his death in 1583.

Scientific and Polemical Writings

Beyond his political theology, he authored numerous works focused on medicine, alchemy, and astrology. He frequently attacked the systems of Paracelsus, acting as a defender of traditional Galenic medicine, though he acknowledged minor merits within Paracelsian thought. His academic output reflects a career deeply rooted in both the professional practice of medicine and the rigorous scholarly traditions of the Reformation era.

Fast facts

Questions readers ask

What is the primary argument of the Theses?

The author argued that civil authorities should punish sins committed by Christians, and that the church should not deny sacraments as a form of disciplinary punishment.

Why was he excommunicated in 1570?

He was excommunicated by the local church consistory in Heidelberg on a charge of Socinianism due to his correspondence with individuals in Transylvania.

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