Map of Schwarzburg in 1571, after the Treaty of Speyer (1570).Until 1570, the four sons of count Günther XL ruled Schwarzburg together. Count William lobbied for a division of the county, and in December 1570 a preliminary division was agreed in Speyer. The Unterherrschaft was divided between count William and John Günther I. The Oberherrschaft was ruled jointly by Günther XLI and Albrecht VII.
Own workBased on Atlas des Saale- und mittleren Elbegebietes (Leipzig 1958), [1], [2] and Kurt Herrmann, Die Erbteilungen im Hause Schwarzburg, Buchdruckerei Heinrich John (Halle (Saale), 1919)
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