Classic Anabaptist and Mennonite History Collection (19 vols.)
It's got the complete works of Menno Simons, the father of the Mennonite movement. Plus several books of history from this important period of church history known as the Radical Reformation, from which several modern denominations take their roots, and much more. Read about the background of pacifism as a theological position, learn about what happens when radical reform movements get too radical, be sobered by the period of Christian-on-Christian martyrdom that happened in the 16th and 17th centuries and yet amazed at the strength of faith of these forbears who would not budge in their faith even if it meant death.