In the first of Luther’s three tracts published in 1520, To the Christian Nobility of the German Nation out the signature doctrines of Lutheranism.  These include the priesthood of all believers and the two kingdoms.  It was written in German and not Latin.  It also sets out for the German laity a concise attack on three main doctrines of the Roman Catholic Church.  To find out more….

You may read this tract in its entirety at:

http://www.bartleby.com/36/5/1000.html

A video documentary on Luther’s life may be seen here:

https://www.youtube.com/watch?v=fp77mcJKsIk