▁trif unction al ▁th esis ▁is ▁primarily ▁associated ▁with ▁the ▁French ▁myth ograph er ▁Georges ▁Dum é zil , ▁who ▁proposed ▁it ▁in ▁ 1 9 2 9 ▁in ▁the ▁book ▁Fl amen - B rah man , ▁and ▁ ▁later ▁in ▁Mit ra - Var una . ▁ ▁Three - way ▁division ▁According ▁to ▁Dum é zil ▁( 1 8 9 8 – 1 9 8 6 ), ▁Pro to - Ind o - Europe an ▁society ▁compr ised ▁three ▁main ▁groups ▁corresponding ▁to ▁three ▁distinct ▁functions : ▁ ▁S over e ig nt y , ▁which ▁fell ▁into ▁two ▁distinct ▁and ▁complement ary ▁sub - parts : ▁▁ ▁one ▁formal , ▁jur id ical ▁and ▁priest ly ▁but ▁world ly ; ▁▁ ▁the ▁other ▁powerful , ▁un predict able , ▁and ▁also ▁priest ly ▁but ▁root ed ▁in ▁the ▁super natural ▁world . ▁▁ ▁Military , ▁connected ▁with ▁force , ▁the ▁military ▁and ▁war . ▁ ▁Product ivity , ▁her ding , ▁far ming ▁and ▁craft s ; ▁ruled ▁by ▁the ▁other ▁two . ▁▁ ▁In ▁the ▁Pro to - Ind o - Europe an ▁myth ology ▁each ▁social ▁group ▁had ▁its ▁own ▁god ▁or ▁family ▁of ▁gods ▁to ▁represent ▁it ▁and ▁the ▁function ▁of ▁the ▁god ▁or ▁gods ▁matched ▁the ▁function ▁of ▁the ▁group . ▁Many ▁such ▁divisions ▁occur ▁in ▁the ▁history ▁of ▁Ind o - Europe an ▁soci eties : ▁▁ ▁Southern ▁Russia : ▁Bernard ▁Ser gent ▁associ ates ▁the ▁Ind o - Europe an ▁language ▁family ▁with ▁certain