The Duchy of Saxe-Weimar-Eisenach -LRB- -RRB- was created in NUMBER@1 by the merger of the MISC@1 duchies of Saxe-Weimar and Saxe-Eisenach , which had been in personal union since NUMBER@2 , when the Saxe-Eisenach line had died out .

The two duchies had shared the same ruler since NUMBER@2 , which is when the LOCATION@1 line had died out .
