Landgrave Ernest of HesseRheinfelsRotenburg , was from 1649 to 1658 his death Landgrave of HesseRheinfels and from 1658 until his death Landgrave of HesseRheinfelsRotenburg. Because his brothers died young, all later Landgraves in the Rotenburg Quarter are descendants of Ernest. Hence, Ernest is known as the ancestor of the Catholic Rotenburg Quarter, a group of junior lines of the House of Hesse.
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Source: Wikipedia