ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd tˈɛn, fɹˈɛdɚɹˌɪk kɹˈɪstʃənz jˈʌŋɡɚ bɹˈʌðɚ tʃˈɑːɹlz ˈɔːɡəst wʌz tʃˈoʊzən baɪ ðɪ ᵻstˈeɪts ʌvðə swˈiːdɪʃ ɹˈɛlm æz ðæt nˈeɪʃənz kɹˈaʊn pɹˈɪns, tə səksˈiːd ðɪ ˈɛldɚli ænd tʃˈaɪldləs kˈɪŋ tʃˈɑːɹlz ɹˌoʊmən θˈɜːtiːn.
In 1810, Frederik Christian's younger brother Charles August was chosen by the estates of the Swedish realm as that nation's crown prince, to succeed the elderly and childless King Charles XIII.