Frederick IV, Landgrave of Thuringia, Date of Birth, Date of Death
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Landgrave of Thuringia, Margrave of Meissen
Date of Birth: 
About Frederick IV, Landgrave of Thuringia
- Frederick IV (before 30 November 1384 – 7 May 1440), nicknamed the Peaceful (German: Friedrich der Friedfertige) or the Simple (der Einfältige), 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.
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