Lazarus Ercker

Lazarus Ercker (c. 1530 – 1594) was a Bohemian metallurgist and assay master of a mint near Prague, Bohemia who wrote some of the earliest known treatises on metallurgy entitled ''Beschreibung allerfürnemisten mineralischen Ertzt und Berckwercksarten'' (1574) and ''Münzbuch, wie es mit den Münzen gehalten sind'' (1563). Provided by Wikipedia