Education
Klein studied philosophy, theology, Greek and Hebrew in the University of Königsberg.
Klein studied philosophy, theology, Greek and Hebrew in the University of Königsberg.
In 1637 he became a Lutheran pastor. In 1653 Klein published the first grammar book of the Lithuanian language (Grammatica Litvanica), written in Latin. Klein coined the distinctive Lithuanian letter Ė.
He also wrote a Lithuanian dictionary, but it was left unpublished.
Klein published collections of Lithuanian hymns (Literature giesmes), some of which he wrote himself.