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On 18 March 1814 Elector Wilhelm I of Hesse-Kassel (or Hesse-Cassel) founded the Order of the Iron Helmet (German: Orden vom Eisernen Helm).
Maximilian Gritzner describes the model and the statutes of the order as "influenced by the example of the Iron Cross".
References
Order of the Iron Helmet Wikipedia(Text) CC BY-SA