The Galileo Project
site map

Crollius [Croll], Oswald

1. Dates
Born: Hesse-Kassel, c.1560
Died: Prague, 25 Dec. 1609
Dateinfo: Birth Uncertain
Lifespan: 49
2. Father
Occupation: Magistrate
Mayor of the village of Wetter; no other information about occupation.
No information about financial status.
3. Nationality
Birth: German
Career: France, Germany, Czechoslovakia
Death: Czechoslovakia
4. Education
Schooling: Marburg, M.D., Strassburg, Geneva, Heidelberg
Matriculated in Univ. of Marburg, 1576. I assume B.A.
Apparently early M.D. in 1582.
Later studied at Strasbourg, Geneva, and Heidelberg.
5. Religion
Affiliation: Certainly Protestant; apparently Calvinist
6. Scientific Disciplines
Primary: Iatrochemistry And Alchemy
7. Means of Support
Primary: Medical Practice And Patronage
He was tutor to the d'Esnes family in Lyon, 1583-90.
Tutor then to Count Maximilian von Pappenheim, 1593-7.
From 1593 until his death, medical practice in Prague and Brno.
Rudolf II sometimes consulted him, and also princes.
Croll cured Christian of Anhalt-Bernburg and became his personal physician and then his diplomatic agent in Prague. Christian supported Croll's chemical research. Croll dedicated the Basilica chymica to him.
As agent of Christian, he was in extended close contact with the Czech magnate Wok Ursinus, Herr von Rosenberg, who was also interested in chemistry. Rosenberg financed the publication of the Basilica.
8. Patronage
Types: Court, Aristocracy
In addition to above, Croll met della Porta in travelling as a tutor and dedicated a book to him. As I now know, Porta had no money, and this dedication could not have been related to patronage.
9. Technological Involvement
Types: Medical Practice, Pharmacology
Also developed pharmaceuticals.
10. Scientific Societies
Memberships: None
However, he was part of the circle of occult scientists around Rudolf in Prague.
  1. Allgemeine deutsche Biographie.
  2. Neue deutsche Biographie.
  3. Owen Hannaway, The Chemists and the Word, (Baltimore, 1975), especially pp. 1-3.
  4. Gerald Schroeder, "Oswald Croll," Pharaceutische Industrie, 21 (1959), 405-8.
Compiled by:
Richard S. Westfall
Department of History and Philosophy of Science
Indiana University

Note: the creators of the Galileo Project and this catalogue cannot answer email on geneological questions.

1995 Al Van Helden
Last updated
Home | Galileo | Biography | Chronology | Family | Portraits |
Science | Christianity | Library | About | Site Map | Search

Please note: We will not answer copyright requests.
See the copyright page for more information.