Roger Bacon (c. 1214–1294) – Franciscan friar, made significant contributions to mathematics and optics, has been described as a forerunner of modern scientific method
1795.An archangel revealing the physical nature of the universe to a group of natural philosophers and mathematicians.Etching by James Barry,1795,after his painting.Francis Bacon; Nicolaus Copernicus; Galileo Galilei; Isaac Newton; Thales; René Descartes; Archimedes; Robert Grosseteste; Roger Bacon; James Barry.
Roger Bacon, a 13th century Franciscan Friar, who is considered one of the earliest proponents of the scientific method, is considered the first real European alchemist. (Prior to Bacon, there was some exploration of alchemical theory and ideas, but no real practitioners.) He was primarily interested in the elixir of life and some form of ingestible gold which would prolong life. Bacon's writings on alchemy were used by many other practitioners well into the 19th century.