The Augsburg Confession is the first and most fundamental Confession of the Lutheran Church. It was composed for a public reading at the Diet of Augsburg on June 25, 1530. Although written by Melanchthon, it was presented as the official answer of the undersigned German princes to the summons of Emperor Charles V. Two copies were presented on the same day, one in German, the other in Latin. This work translates a conflation of the German and Latin texts and was prepared for the Concordia Triglotta of 1921. (Introduction by Jonathan Lange)

The Treatise on the Power and Primacy of the Pope (1537) (Latin, Tractatus de Potestate et Primatu Papae), The Tractate for short, is the seventh Lutheran credal document of the Book of Concord. Philip Melanchthon, its author, completed it on February 17, 1537 during the assembly of princes and theologians in Smalcald.

The Apology of the Augsburg Confession was written by Philip Melanchthon during and after the 1530 Diet of Augsburg as a response to the Pontifical Confutation of the Augsburg Confession, Charles V's commissioned official Roman Catholic response to the Lutheran Augsburg Confession of June 25, 1530. It was intended to be a defense of the Augsburg Confession and a refutation of the Confutation. It was signed as a confession of faith by leading Lutheran magnates and clergy at the meeting of the Smalcald League in February, 1537, and subsequently included in the German [1580] and Latin [1584] Book of Concord. As the longest document in the Book of Concord, it offers the most detailed Lutheran...