Landgrave of Hesse-Rotenburg

Hesse-Rotenburg is a former German landgraviate created from the landgraviate of Hesse-Cassel in 1627. Its independence ended in 1834 when the estates not bequeathed to princes Victor and Chlodwig of Hohenlohe-Waldenburg-Schillingsfurst were reunited with Hesse-Kassel.

The line of Hesse-Kassel (or Hesse-Cassel) was founded by William IV, surnamed the Wise, eldest son of Philip the Magnanimous. On his father's death in 1567, he received one half of Hesse, with Cassel as his capital; this formed the Landgraviate of Hesse-Kassel. Additions were made to it by inheritance from his brother's possessions. His son, Maurice the Learned (1572–1632) was Landgrave of Hesse-Kassel from 1592 until 1627. Maurice turned Protestant in 1605, became involved later in the Thirty Years' War, and, after being forced to cede some of his territories to the Darmstadt line, abdicated in 1627 favour of his son William V (1602-1637). His younger sons received apanages, which created several cadet lines of the house (Hesse-Rotenburg, Hesse-Eschwege and Hesse-Rheinfels), of which, with amalgamation, that of Hesse-Rheinfels-Rotenburg survived till 1834.

In 1627, Ernest (1623–1693), a younger son of Maurice, Landgrave of Hesse-Kassel, received Rheinfels and lower Katzenelnbogen as his inheritance. Some years later, on the deaths of two of his brothers, Frederick, Landgrave of Hesse-Eschwege (1617–1655) and Herman IV, Landgrave of Hesse-Rotenburg (1607–1658), he added Eschwege, Rotenburg, Wanfried and other districts to his possessions. Ernest, who was a convert to the Roman Catholic Church, was a great traveller and a voluminous writer. About 1700 his two sons, William (d. 1725) and Charles (or Karl) (d. 1711), divided their territories, and founded the families of Hesse-Rotenburg and Hesse-Wanfried. The latter family died out in 1755, when William's grandson, Constantine (d. 1778), reunited the lands except Rheinfels, which had been acquired by Hesse-Kassel in 1735, and ruled them as Landgrave of Hesse-Rotenburg.

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