Ignatius Gottfried Kaim
Ignatius Gottfried Kaim was a chemist from the Holy [Roman Empire].
In his dissertation De metallis dubiis published in 1770 Kaim describes the reduction of manganese oxide with carbon and the formation of a brittle metal. This is the first description of manganese metal several years before the better known synthesis of Johan [Gottlieb Gahn] in 1774.