ana ▁and ▁Nag ar av ac aka . ▁Dig amb ara ▁call ▁him ▁Um as v amin . ▁ ▁According ▁to ▁Vid y ab hus ana ' s ▁book ▁published ▁in ▁ 1 9 2 0 , ▁Um as w ati ▁died ▁in ▁ 8 5 ▁CE . ▁More ▁recent ▁scholar ship , ▁such ▁as ▁by ▁Pad man ab h ▁J ain i ▁on ▁the ▁other ▁hand , ▁places ▁him ▁later , ▁likely ▁in ▁the ▁ 2 nd - century . ▁Modern ▁sch ol ars ▁such ▁as ▁Walter ▁S la je ▁state ▁that ▁there ▁are ▁disag re ements ▁in ▁d ating ▁Um as w ati , ▁and ▁even ▁whether ▁Um as w ati ▁and ▁Um as w ami ▁were ▁two ▁different ▁persons , ▁who ▁lived ▁som etime ▁between ▁ 2 nd - ▁to ▁ 5 th - century ▁CE . ▁Paul ▁D und as ▁agre es ▁that ▁T att var tha ▁S ut ra ▁is ▁among ▁the ▁oldest ▁surv iving ▁J ain a ▁philosophy ▁text ▁along ▁with ▁Bh ag av ati ▁S ut ra ▁and ▁the ▁older ▁R s ib has it ani , ▁but ▁dates ▁Um as w ati ▁and ▁the ▁text ▁to ▁the ▁ 4 th - ▁to ▁ 5 th - century . ▁ ▁Um as w ati ▁author ed ▁his ▁script ural ▁work ▁the ▁T att var tha ▁S ut ra ▁when ▁he ▁was ▁in ▁P atal i put ra ▁or ▁K us um ap ura ▁( now ▁known ▁as ▁Pat na , ▁Bi har ). ▁He ▁was ▁the