hiː mˌeɪks hɪz ˈoʊnli hɪstˈɔːɹɪkəl ɐpˈɪɹəns æz məkbˈɛθ ɹˌɑːzmɑːɹkˈɛnsɪs ᵻpˈɪskɑːpəs ˈaɪ.ˈiː. "mˈæk bˈɛθæd, bˈɪʃəp ʌv ɹˈoʊzmɑːɹki"ɪn ɐ lˈɪst ʌv wˈɪtnəsᵻz tʊ ɐ tʃˈɑːɹɾɚ ɡɹˈæntᵻd baɪ kˈɪŋ dˈeɪvɪd aɪ ʌv skˈɑːtlənd tə ðə tʃˈɜːtʃ ʌv dˈʌnfɚmlˌaɪn, kənfˈɜːmɪŋ ðə pɹˈiːviəs ɹˈaɪts ʌv ðæt tʃˈɜːtʃ.
He makes his only historical appearance as Macbeth Rosmarkensis Episcopus (i.e. "Mac Bethad, Bishop of Rosemarkie") in a list of witnesses to a charter granted by King David I of Scotland to the Church of Dunfermline, confirming the previous rights of that church.