The Schaff–Herzog Encyclopedia of Religious Knowledge is a religious encyclopedia. It is based on an earlier German encyclopedia, the Realencyklopädie für protestantische Theologie und Kirche. Like the Realencyklopädie, it focuses on Christianity from a primarily Protestant point of view. The final edition, titled The New Schaff–Herzog Encyclopedia of Religious Knowledge, was published 1908–14 in 13 volumes, based on the third edition of the Realencyklopädie (1896–1909). Source: Wikipedia (en)