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19 hours ago · County of Isenburg. Isenburg (pink, right) and Lower Isenburg (pink, left) around 1400. The County of Isenburg was a region of Germany located in southern present-day Hesse, located in territories north and south of Frankfurt. The states of Isenburg emerged from the Niederlahngau (located in the Rhineland-Palatinate ), which partitioned in 1137 ...
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