Extranea collection of the Swedish State Archives in Stockholm. The manuscript overlaps with Alfabetum Rutenorum, a Russian textbook, printed in Stockholm by Peter van Selov around 1640. Both the imprint and the manuscript comprise the Cyrillic letters with their names in Cyrillic and in transliteration and the most central parts of Luther's small catechism. Moreover, the manuscript contains the shapes of the Cyrillic letters in the Chancery cursive style (skoropis') and a table with the Cyrillic numerals, from 1 to 1 000 000. The manuscriptapparently intended as a new Russian textbook for future translators of Russianwas dated by the author to the 2 nd half of the 1660s and attributed to G. Kotošichin, a former secretary of the Diplomatic Chancery who was living and working in Sweden from spring 1666 to his execution in the fall of 1667.