ɡˈʌnθaɪm wʌz ɪstˈæblɪʃt ɪn mˌɛɹoʊvˈɪŋɡiən tˈaɪmz fˈoːɹhˈʌndɹɪd ˈeɪɾi wˈʌn fˈaɪvhˈʌndɹɪd sˈɪksti æz ɐ fɹˈæŋkɪʃ mˈɪlətˌɛɹi kˈɑːləni æt ðə dʒˈʌŋkʃən ʌv sˌʌm ˈoʊld ɹˈoʊmən ɹˈoʊdz ɪnðə fˈɔːɹɪst.
Guntheim was established in Merovingian times (481 – 560) as a Frankish military colony at the junction of some old Roman roads in the forest.