Book excerpt: In the five hundred years since the publication of Martin Luther's Ninety- Five Theses, a rich set of traditions have grown up around that action and the subsequent events of the Reformation. This up-to-date dictionary by leading theologians and church historians covers Luther's life and thought, key figures of his time, and the various traditions he continues to influence. Prominent scholars of the history of Lutheran traditions have brought together experts in church history representing a variety of Christian perspectives to offer a major, cutting-edge reference work. Containing nearly six hundred articles, this dictionary provides a comprehensive overview of Luther's life and work and the traditions emanating from the Wittenberg Reformation. It traces the history, theology, and practices of the global Lutheran movement, covering significant figures, events, theological writings and ideas, denominational subgroups, and congregational practices that have constituted the Lutheran tradition from the Reformation to the present day.