ABSTRACT
An iatrochemist and member of a circle of Paracelsian critics of Aristotelianism, he studied medicine in Geneva, Strasbourg, and Heidelberg and received a doctorate in medicine ca. 1582. After finishing his studies, Crollius became a tutor for the children of the French family D’Esnes and the Counts of Pappenheim-Stühlingen. From ca. 1593 he traveled through Poland, Hungary, Silesia, and Bohemia as a physician and from 1597 he practiced in Prague. A sensational healing of Prince Christian I of Anhalt-Bernburg made him well known, and Emperor Rudolph II consulted him repeatedly. Crollius was granted a coat of arms by Elector Friedrich IV of the Palatinate in 1591.
