Andreas Libavius (Libau) (1540-1616 A.D.)
The German alchemist Andreas Libau  was the first to describe the preparation of HCl and aqua regia ("royal water"), a mixture of nitric and hydrochloric that could dissolve gold. Libau is better known by the Latinized name Libavius. He published Alchemia in 1597 A.D., a summary of medieval achievement in chemistry, and he believed in the transmutation of metals.