▁become ▁the ▁new ▁residence ▁of ▁the ▁Duch y ▁of ▁Wür ttemberg ▁as ▁it ▁was ▁closer ▁to ▁M ö mp el g ard ▁than ▁the ▁Wür ttemberg ▁capital ▁Stuttgart . ▁However , ▁Frederick ▁I ▁died ▁in ▁ 1 6 0 8 ▁and ▁his ▁plans ▁never ▁came ▁to ▁f ru ition . ▁ ▁The ▁sons ▁of ▁Frederick ▁I ▁established ▁the ▁du cal ▁house ▁of ▁Wür ttemberg - Ne uen stadt , ▁a ▁branch ▁line ▁of ▁the ▁House ▁of ▁Wür ttemberg ▁after ▁a ▁Für st br ü der licher ▁Ver gleich ▁— ▁a ▁mut ual ▁agreement ▁made ▁between ▁du cal ▁brothers ▁on ▁ 7 ▁June ▁ 1 6 1 7 . ▁The ▁el dest ▁son , ▁Johann ▁Friedrich , ▁assumed ▁bar ony ▁over ▁the ▁Duch y ▁of ▁Wür ttemberg ▁while ▁the ▁second ▁young est ▁son , ▁Frederick ▁Ach illes , ▁was ▁be que athed ▁Ne uen stadt ▁Castle ▁and ▁an ▁annual ▁end ow ment ▁of ▁ 1 0 , 0 0 0 ▁gu ilder . ▁ ▁Children ▁▁ ▁Frederick ▁and ▁his ▁sp ouse ▁Sib yl la ▁of ▁An halt ▁( 1 5 6 4 – 1 6 1 4 ), ▁daughter ▁of ▁Jo achim ▁Ernst , ▁Prince ▁of ▁An halt , ▁had ▁the ▁following ▁children : ▁▁ ▁Johann ▁Frederick ▁( 1 5 8 2 – 1 6 2 8 ) ▁ ▁George ▁Frederick ▁( 1 5 8 3 – 1 5 9 1 ) ▁ ▁Sib yl la ▁Elisabeth ▁( 1 5 8 4 – 1 6 0 6 ) ▁- ▁married ▁John ▁George ▁I ,