Whakaotihia te rerenga e whai ake nei: I te tau 1804 ka uru te Duke Charles Augustus ki nga mahi torangapu o Europi ma te marena i tana tama me te kawana a Charles Frederick ki te Grand Duchess Maria Pavlovna, te tuahine o Emperor Alexander I o Russia. Heoi, i te wa ano ka uru atu ia ki Prussia i te
Ko te Pakanga o te Huinga Tuawha ki te Emepaea o France, i muri i te hinganga i te Pakanga o Jena-Auerstedt i akiakihia kia uru atu ki te Napoleon Confederation o te Rhine i te tau 1806. I te tau 1809 Saxe-Weimar me Saxe-Eisenach, i whakakotahihia anake i roto i te tangata o te rangatira, i whakakotahihia ki te Duchy o Saxe-Weimar-Eisenach.