Sayn-Altenkirchen [SEP] dissolved or abolished
of Saxe-Eisenach — Johanette's son — and secondly by Duke William Henry of Saxe-Eisenach — Johanette's grandson. William Henry died childless and Sayn-Altenkirchen was inherited by Charles, Margrave of Brandenburg-Ansbach, Johanette's great-grandson.
The County of Sayn-Wittgenstein-Sayn-Altenkirchen ended when it was mediatised to Nassau-Weilburg in 1803.
Queen Caroline, wife of George II of the United Kingdom, was co-heiress to this County, but she never inherited it and her
Juliane made regent. But shortly after the treaty, the county was split between the two. Ernestine's portion was called "Sayn-Wittgenstein-Hachenburg". Johanette's was "Sayn-Wittgenstein-Sayn-Altenkirchen" (or Sayn-Altenkirchen for short). Their mother remained regent for both counties until 1652, when Johanette and Ernestine separately ruled their respective Counties. Sayn-Wittgenstein-Hachenburg was inherited by Countess Magdalena Christina in 1661 following Ernestine's death. It passed to the Burgraves of Kirchberg in 1715,