▁built ▁nearby . ▁Frederick ▁I ▁decis ively ▁secured ▁his ▁family ' s ▁poss essions ▁with ▁the ▁implementation ▁of ▁the ▁prim ogen iture ▁in ▁ 1 6 8 5 . ▁His ▁son ▁and ▁successor ▁Duke ▁Frederick ▁II ▁gained ▁further ▁Ernest ine ▁territ ories ▁upon ▁the ▁death ▁of ▁Duke ▁Albert ▁V ▁of ▁Sax e - C ob urg ▁in ▁ 1 6 9 9 ▁and ▁Duke ▁Christian ▁of ▁Sax e - E isen berg ▁in ▁ 1 7 0 7 . ▁ ▁Sax e - G oth a - Al ten burg ▁remained ▁one ▁of ▁the ▁might iest ▁Ernest ine ▁duch ies ▁under ▁the ▁rule ▁of ▁Duke ▁Frederick ▁III ▁from ▁ 1 7 3 2 . ▁He ▁had ▁the ▁pal aces ▁and ▁gard ens ▁in ▁Goth a ▁re built ▁in ▁a ▁lav ish ▁Bar o que ▁style ▁and ▁supported ▁the ▁religious ▁refuge es ▁of ▁the ▁Mor av ian ▁Church ▁in ▁Ne ud iet endorf . ▁His ▁sister ▁August a ▁married ▁Prince ▁Frederick ▁of ▁Wales ▁in ▁ 1 7 3 6 , ▁their ▁first - born ▁son ▁George ▁III ▁was ▁crown ed ▁King ▁of ▁Great ▁Britain ▁and ▁Ireland ▁in ▁ 1 7 6 0 . ▁Frederick ▁made ▁his ▁court ▁a ▁centre ▁of ▁the ▁En light en ment ▁( A uf klär ung ), ▁continued ▁by ▁his ▁son ▁and ▁successor ▁Ernest ▁II , ▁who ▁ruled ▁from ▁ 1 7 7 2 . ▁At ▁the ▁inst ig ation ▁of ▁Johann ▁Wolfgang ▁von ▁Go ethe , ▁he ▁promoted ▁the ▁painting ▁o e uv re ▁of ▁Johann ▁Heinrich ▁Wilhelm ▁T