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Books about Batenburgers:
Melchiorieten, Munstersen en Batenburgers: Een sociologische analyse van een millennistische beweging uit de 16e... by Lammert Gosse Jansma (1977)
Wiki information Batenburgers:
The Batenburgers were members of a radical Anabaptist sect led by Jan van Batenburg, that flourished briefly in the 1530s in the aftermath of the Münster Rebellion. They were called Zwaardgeesten by the nonviolent mainstream Anabaptists.