Answer the following question: What type of details about wilhelm heinrich , duke of saxe-eisenach  can be gathered from the following bio?  Bio: wilhelm heinrich , duke of saxe-eisenach -lrb- oranjewoud , 10 november 1691 -- eisenach , 26 july 1741 -rrb- , was a duke of saxe-eisenach . he was the eldest and only surviving son of johann wilhelm , duke of saxe-eisenach and his first wife amalie of nassau-dietz . wilhelm heinrich first married albertine juliane of nassau-idstein in idstein on 15 february 1713 . this marriage was childless . he married his second wife anna sophie charlotte of brandenburg-schwedt in berlin on 3 june 1723 , just eight months after the death of albertine juliane . the second marriage was also childless . wilhelm heinrich acceded to the duchy of saxe-eisenach in 1729 upon the death of his father and was succeeded by his second cousin , duke ernst august i of saxe-weimar . the personal union between eisenach and weimar created by this succession was only nominal until 1809 , when the two patrimonies were formally united .
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