Rubuta ci gaba don wannan sakin layi - A karni na 1 kafin haihuwar Yesu, kabilar Sequani (mafi yawan "Gaul na Gauls" a cewar masanin tarihi Henri Martin), wanda ya kasance a kusa da Besançon, ya zauna a Sundgau. Daga shekara ta 70 kafin haihuwar Yesu, sun yi yaƙi da maƙwabtansu, Aedui, suna kira ga sojojin Jamus, wanda Ariovistus ya jagoranci. Lokacin da rikici ya ƙare, Jamusawa suka zauna a yankin, kuma Sequani, don cire su ya yi kira ga Romawa. Julius Kaisar ya kayar da Ariovistus a 58 BC kusa da Cernay, kuma dogon mulkin Romawa ya fara. Wannan ya ƙare ba zato ba tsammani a cikin 405, lokacin da Alamani ya ƙetare Rhine kuma ya mamaye Sundgau. Su kuma, Franks sun bi su bayan nasarar da suka samu a yakin Tolbiac
a cikin 496. Sundgau an haɗa shi cikin masarautar Austrasia kuma an gabatar da Kiristanci a ƙarƙashin Merovingians.