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Friedrich IV or Friedrich IV der Friedfertige was Landgrave of Thuringia (1406–1440).
Friedrich superseded Balthasar (1349–1406) and preceded Friedrich V der Sanftmütige (1440–1445).
Landgrave Balthasar of Thuringia was Margrave of Meissen and Landgrave of Thuringia from the House of Wettin.
Frederick II, The Gentle was Elector of Saxony (1428–1464) and was Landgrave of Thuringia (1440–1445).
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Frederick IV may refer to:
Frederick IV, nicknamed the Peaceful or the Simple, was a member of the House of Wettin and Margrave of Meissen who ruled as the last independent Landgrave of Thuringia from 1406 until his death.