const ru ctions ▁of ▁a ▁Bron ze ▁Age ▁P IE ▁society , ▁based ▁on ▁voc ab ul ary ▁items ▁like ▁" w heel ", ▁do ▁not ▁necessarily ▁hold ▁for ▁the ▁An atol ian ▁branch , ▁which ▁appears ▁to ▁have ▁separated ▁at ▁an ▁early ▁stage , ▁prior ▁to ▁the ▁in vention ▁of ▁whe e led ▁vehicles . ▁ ▁According ▁to ▁Ren f rew ▁( 2 0 0 4 ), ▁the ▁spread ▁of ▁Ind o - Europe an ▁proceeded ▁in ▁the ▁following ▁steps : ▁Ar ound ▁ 6 5 0 0 ▁BC : ▁Pre - Pro to - Ind o - Europe an , ▁in ▁An atol ia , ▁spl its ▁into ▁An atol ian ▁and ▁Arch a ic ▁Pro to - Ind o - Europe an , ▁the ▁language ▁of ▁the ▁Pre - Pro to - Ind o - Europe an ▁far mers ▁who ▁migr ate ▁to ▁Europe ▁in ▁the ▁initial ▁far ming ▁dispers al . ▁Arch a ic ▁Pro to - Ind o - Europe an ▁languages ▁occur ▁in ▁the ▁B alk ans ▁( Star če vo – K ör ös ▁culture ), ▁in ▁the ▁Dan ube ▁valley ▁( Linear ▁Pot tery ▁culture ), ▁and ▁possibly ▁in ▁the ▁Bug - D ni estr ▁area ▁( E astern ▁Linear ▁pot tery ▁culture ). ▁Ar ound ▁ 5 0 0 0 ▁BC : ▁Arch a ic ▁Pro to - Ind o - Europe an ▁spl its ▁into ▁North western ▁Ind o - Europe an ▁( the ▁ancest or ▁of ▁Ital ic , ▁C elt ic