The Divine Service is a title given to the Eucharistic liturgy as used in the various Lutheran churches. It has its roots in the pre-Tridentine Mass as revised by Martin Luther in his Formula missae ("Form of the Mass") of 1523 and his Deutsche Messe ("German Mass") of 1526. It was further developed through the Kirchenordnungen ("church orders") of the sixteenth and seventeenth centuries that followed in Luther's tradition.