Kammala jumla mai zuwa: Bayan yaƙe-yaƙe na Punic, Sabratha ya zama wani ɓangare na masarautar Numidian mai ɗan gajeren lokaci na Massinissa kafin wannan ya haɗu da Jamhuriyar Roman a matsayin lardin Afirka Nova a ƙarni na 1 kafin haihuwar Yesu. Daga baya an romanized kuma an sake gina shi a ƙarni na 2 da na 3 CE. Sarkin sarakuna Septimius Severus an haife shi a kusa da Leptis Magna, kuma Sabratha ya kai ga mafi girma a lokacin mulkin Severans, lokacin da kusan ya ninka girmansa. Birnin ya lalace sosai ta girgizar ƙasa a ƙarni na huɗu, musamman
girgizar kasa ta 365. Ya faɗi ƙarƙashin ikon masarautar Vandal a ƙarni na 5, tare da manyan ɓangarorin garin da aka watsar. Ya ji daɗin ƙaramin farkawa a ƙarƙashin mulkin Byzantine, lokacin da aka gina majami'u da yawa da bango mai kariya (duk da cewa kawai yana kewaye da ƙaramin ɓangaren garin). Garin ya kasance wurin zama na bishopric. A cikin shekaru ɗari na mamayewar Musulmi na Maghreb, cinikin ya koma wasu tashoshin jiragen ruwa kuma Sabratha ya ragu zuwa ƙauye.