Guglielmo Gratarolo

Guglielmo Gratarolo (16 May 1516 – 16 April 1568) was an Italian doctor and alchemist born in Bergamo. He pursued his studies in Padua and Venice. As a follower of Calvinism, Gratarolo found himself in need of refuge, leading him to seek sanctuary in Graubünden and Strasbourg before finally establishing himself in Basel in 1552. In Basel, he dedicated himself to teaching medicine and undertaken the significant task of editing and publishing various alchemical works. His most notable contribution in this regard is the 1561 collection titled *Verae alchemiae artisque metallicae*, which was later reprinted in 1572. This compilation was heavily influenced by earlier alchemical texts and, in turn, served as a basis for later works like the *Theatrum Chemicum*. Gratarolo's focus was particularly on publishing the works of authors like Pseudo-Lull and Pseudo-Geber.