The Augsburg Confession, June 25, 1530.

The authors of the Formula of Concord, 1580, considered themselves--with Luther--theologians of the Augsburg Confession.

Men risked their lives to confess the truth before their warrior emperor, Charles V, who hated the Lutherans.

The threat of Muslim invasion drew Charles away from his plan of destroying the budding Lutheran Church.

Emperor Charles V - "I speak Latin to my counselors, Spanish to God,
and German to my horse."
Notice the inbred Hapsburg jaw, which made closing his mouth difficult.