Albert IV, Duke of Saxe Eisenach
Albrecht, Duke of SaxeEisenach, was a ruler of the duchy of SaxeEisenach. He was the seventh son of Johann, Duke of SaxeWeimar, and Dorothea Maria of Anhalt. His regnal name Albert IV derives from the numbering of the duchy of Saxony as a whole, not specifically to the succession in SaxeEisenach.
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Source: Wikipedia