The Book of Concord (1580) or Concordia (often referred to as the Lutheran Confessions) is the historic doctrinal standard of the Lutheran Church, consisting of ten credal documents recognized as authoritative in Lutheranism since the 16th century. They are also known as the symbolical books of the Evangelical Lutheran Church. The Book of Concord was published in German on June 25, 1580 in Dresden, the fiftieth anniversary of the presentation of the Augsburg Confession to Emperor Charles V at the Diet of Augsburg. The authoritative Latin edition was published in 1584 in Leipzig.