Although historically of Siouan-language origin, ancestors of the Biloxi shared similar cultural features with other peoples in the Southeast, what anthropologists call the Southeastern Ceremonial Complex (SECC).
ɔːlðˈoʊ hɪstˈɔːɹɪkli ʌv sɪwˈɑːnlˈæŋɡwɪdʒ ˈɔːɹɪdʒˌɪn, ˈænsɛstɚz ʌvðə baɪlˈɑːksi ʃˈɛɹd sˈɪmɪlɚ kˈʌltʃɚɹəl fˈiːtʃɚz wɪð ˈʌðɚ pˈiːpəlz ɪnðə sˈaʊθiːst, wˌʌt ˌænθɹəpˈɑːlədʒˌɪsts kˈɔːl ðə sˈaʊθiːstɚn sˌɛɹᵻmˈoʊnɪəl kˈɑːmplɛks sˈɛk.