The Augsburg Confession, the principal doctrinal statement of the theology of Martin Luther and the Lutheran reformers, was written largely by Phillip Melanchthon. At its heart it confesses the justification of sinners by grace alone, through faith alone, for the sake of Christ alone. Signed by leaders of many German cities and regions, the confession was formally presented to the Holy Roman Emperor Charles V at Augsburg, Germany, on June 25, 1530. A few weeks later Roman Catholic authorities rejected the Confession, which Melanchthon defended in the Apology of the Augsburg Confession (1531). In 1580 the Unaltered Augsburg Confession was included in the Book of Concord.
Lord God, heavenly Father, You preserved the teaching of the apostolic Church through the confession of the true faith at Augsburg. Continue to cast the bright beams of Your light upon Your Church that we, being instructed by the doctrine of the blessed apostles, may walk in the light of Your truth and finally attain to the light of everlasting life; through Jesus Christ, our Lord, who lives and reigns with You and the Holy Spirit, one God, now and forever. Amen.
Here is an interesting illustration of the articles of the Augsburg Confession. The much higher resolution, though much larger, version of the image may be found in the Wikipedia commons here.