ɪn mˈɜːsbɜːɡ ˌɔn ˈeɪtiːn fˈɛbɹuːˌɛɹi wˈʌn θˈaʊzənd sˈɪkshˈʌndɹɪd ˈeɪɾi, jˈoʊhɑːn ˈɜːnst mˈæɹid fˈɜːstli sˈoʊfi hˈɛdwɪɡ ʌv sˈæksmˈɜːsbɜːɡ, ɐ dˈɔːɾɚɹ ʌv kɹˈɪstʃən ˈaɪ, dˈuːk ʌv sˈæksmˈɜːsbɜːɡ.
In Merseburg on 18 February 1680, Johann Ernst married firstly Sophie Hedwig of Saxe-Merseburg, a daughter of Christian I, Duke of Saxe-Merseburg.