ˌɔn twˈɛnti sˈɛvən noʊvˈɛmbɚ wˈʌn θˈaʊzənd sˈɪkshˈʌndɹɪd sˈɛvənti sˈɛvən hiː wʌz ɡˈɪvən ðə ɹˈiːdʒənsi ˌoʊvɚ hɪz nˈɛfjuː ˈæftɚ ðə dˈɛθ ʌv hɪz ˈoʊldɚ bɹˈʌðɚ ænd wɪð ðætðə ɹˈiːdʒənsi ˌoʊvɚ wˌuːətˈɛmbɜːɡ.
On 27 November 1677 he was given the regency over his nephew after the death of his older brother and with that the regency over Württemberg.