haʊˈɛvɚ, ɪn wˈʌn θˈaʊzənd sˈɪkshˈʌndɹɪd ˈeɪɾi, ðə bɹˈʌðɚz kəŋklˈuːdᵻd ɐ tɹˈiːɾi dᵻvˈaɪdɪŋ ðə pətˈɜːnəl lˈændz ænd jˈoʊhɑːn ˈɜːnɪst bɪkˌeɪm dˈuːk ʌv sˈækssˈɑːlfɛld, wɪððə tˈaʊnz ʌv ɡɹˈɛfɛnθəl, pɹəbstsˈɛlə ænd pˈɜːsnɛk.
However, in 1680, the brothers concluded a treaty dividing the paternal lands and Johann Ernest became duke of Saxe-Saalfeld, with the towns of Gräfenthal, Probstzella and Pössneck.