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Sayn-Wittgenstein-Sayn-Altenkirchen was a German County.
At first, Princesses Johanette and Ernestine were made joint sovereign Countesses of Sayn-Wittgenstein-Sayn, under regency of the Archbishop of Köln, until it was settled with a treaty in 1648, when the County was split and their mother Dowager Countess Luise Juliane was made regent. Ernestine's portion was called Sayn-Wittgenstein-Hachenburg (or Sayn-Hachenburg for short), a title which descended through the female line and is now a title of the Grand Duke of Luxembourg, while Johanette's was Sayn-Wittgenstein-Sayn-Altenkirchen (or Sayn-Altenkirchen for short).