The medieval phase of the language now spoken between Korosko and Ḥannak on the Upper Nile is known to us since 1906, when first documents were brought to Berlin and deciphered by Professor H. Schäfer. In 1913 a full inventory of the then available material was published by the late Professor F. Ll. Griffith, in the proceedings of the Prussian Academy. It was completed by a subsequent article in 1928.
I am here presenting a series of notes on Griffith's texts, obtained mainly by a careful comparison of the medieval with the modern language. May they serve to smooth the path of some future student.