Samuil Micu Klein (September 1745 – 13 May 1806) was a Romanian Greek-Catholic theologian, historian, philologist and philosopher, a member of the Enlightenment-era movement of Transylvanian School (Şcoala Ardeleană). He is the author of Elementa linguae daco-romanae sive valachicae, a book which is the reference point for the start of Modern Romanian language period.[1]