Cyrillic

     Tradition ascribes the Cyrillic alphabet to Saints Cyril and Methodius, missionaries to the Slavs in the 9th century, but the alphabet was probably invented in the 10th century possibly by St. Kliment of Ohrid. It is used to write Old Church Slavonic. It has experienced revision most recently in 1917-1918 when four letters were eliminated. The form of the letters has also changed over time.

Russian

     The Russian alphabet is a modern version of the Cyrillic alphabet with the same 30 letters. Like Cyrillic it is based on the Greek alphabet with additional letters for sounds missing in Greek.