Manya-manyan yankunan tsohon Dacia, waɗanda mutanen Thraciyan suka cika a farkon zamanin ƙarfe na farko, ƙaura mai yawa na Scythiyawa na Iran suka yi ƙaura daga gabas zuwa yamma a farkon rabin ƙarni na farko KZ.An bi su da wani babban raƙuman ruwa na Celts da ke ƙaura zuwa yamma.^[105] Celts sun isa arewa maso yammacin Transylvania a kusan 400-350 KZ a matsayin wani ɓangare na babban ƙaura zuwa gabas.^[106] Lokacin da mayaƙan Celtic suka fara shiga waɗannan yankuna, ƙungiyar da alama sun haɗu da yawan gida na farkon Dacians kuma sun haɗa al'adun al'adun Hallstatt da yawa.^[107]A kusa da karni na 2 KZ Transylvania, Celtic Boii ya zauna a arewacin yankin Dunántúl, a kudancin Slovakia na zamani da kuma a arewacin yankin Hungary a kusa da tsakiyar Bratislava na zamani.^[108] Mambobin ƙungiyar kabilar Boii, Taurisci da Anarti sun zauna a arewacin Dacia tare da ainihin kabilar Anarti da aka samu a yankin Upper Tisa.Anartophracti daga kudu maso gabashin Poland na zamani ana ɗaukar wani ɓangare na Anarti.^[109] Scordiscan Celts mazauna kudu maso gabas na Ƙofar Iron na Danube ana iya la'akari da wani yanki na al'adun Celtic na Transylvanian.^{[110 <]} > Ƙungiyar Brittogaul kuma ta ƙaura zuwa yankin.^[111]Celts sun fara shiga yammacin Dacia, sannan har zuwa arewa maso yamma da tsakiyar Transylvania.^[112] Yawancin binciken binciken kayan tarihi yana nuna girman yawan mutanen Celtic da ke zama na dogon lokaci a tsakanin 'yan asalin.^[113] Shaidar archaeological ta nuna cewa waɗannan Celts ta Gabas sun shiga cikin yawan Geto-Dacian.^[114]