▁was ▁accepted ▁as ▁another ▁V eda ▁much ▁later ▁than ▁the ▁first ▁three , ▁by ▁both ▁orth odox ▁and ▁heter odox ▁trad itions ▁of ▁Indian ▁philosoph ies . ▁The ▁early ▁Buddh ist ▁Nik aya ▁texts , ▁for ▁example , ▁do ▁not ▁recognize ▁Ath ar v av eda ▁as ▁the ▁fourth ▁V eda , ▁and ▁make ▁references ▁to ▁only ▁three ▁V ed as . ▁Ol son ▁states ▁that ▁the ▁ult imate ▁accept ance ▁of ▁Ath ar v av eda ▁as ▁the ▁fourth ▁V eda ▁probably ▁came ▁in ▁the ▁ 2 nd ▁half ▁of ▁the ▁ 1 st ▁mill en ni um ▁B CE . ▁However , ▁notes ▁Max ▁M ull er , ▁the ▁h ym ns ▁of ▁Ath ar v av eda ▁existed ▁by ▁the ▁time ▁Ch and og ya ▁Up an ish ad ▁was ▁completed ▁( ~ 7 0 0 ▁B CE ), ▁but ▁were ▁then ▁referred ▁to ▁as ▁" h ym ns ▁of ▁Ath ar v ang iras ah ". ▁ ▁F rit s ▁Sta al ▁states ▁that ▁the ▁text ▁may ▁be ▁a ▁compilation ▁of ▁poetry ▁and ▁knowledge ▁that ▁developed ▁in ▁two ▁different ▁regions ▁of ▁ancient ▁India , ▁the ▁Kur u ▁region ▁in ▁northern ▁India ▁and ▁the ▁Pan cal as ▁region ▁of ▁eastern ▁India . ▁The ▁former ▁was ▁home ▁to ▁P ai pp al ā da , ▁whose ▁name ▁was ▁derived ▁from ▁the ▁sacred ▁fig ▁tree ▁named ▁Pi pp ala ▁( S ansk rit : ▁ प ि प ् प ल ). ▁This ▁school ' s ▁compos itions ▁were ▁in ▁the ▁R