A shekara ta 298 K.Z., ƙabilar Celtic sun isa ƙasar Bulgeriya a yau kuma suka yi arangama da sojojin Sarkin Kassander na Makidoniya a Dutsen Haemos (Stara Planina).Macedonia sun yi nasara a yaƙin, amma wannan bai hana Celtic ci gaban ba.Yawancin al'ummomin Thracian, waɗanda mamayar Macedonia ta raunana, sun faɗi ƙarƙashin ikon Celtic.^[12]A cikin 279 KZ, ɗaya daga cikin sojojin Celtic, wanda Comontorius ya jagoranta, ya kai hari Thrace kuma ya yi nasara a ci shi.Comontorius ya kafa daular Tylis a yankin da ke gabashin Bulgaria a yanzu.^[13] Ƙauyen Tulovo na zamani yana ɗauke da sunan wannan masarauta mai ɗan gajeren lokaci.Mu'amalar al'adu tsakanin Thracians da Celts suna shaida ta abubuwa da yawa da ke ɗauke da abubuwa na al'adu biyu, kamar karusar Mezek da kusan ma'aunin Gundestrup.^[14]Tylis ya dade har zuwa 212 KZ, lokacin da Thracians suka sami nasarar dawo da babban matsayinsu a yankin kuma suka wargaza shi.^[15] Ƙananan makada na Celts sun tsira a Yammacin Bulgaria.Ɗaya daga cikin irin waɗannan kabilan sune Serdi, wanda Serdica - tsohuwar sunan Sofia - ya samo asali.^[16] Ko da yake Celts sun kasance a cikin Balkans fiye da karni guda, tasirinsu a kan tsibirin ya kasance mai sauƙi.^[13] A ƙarshen karni na 3, sabuwar barazana ta bayyana ga mutanen yankin Thracian a cikin siffar daular Roma.