eta ur ilia ). ▁T ogether ▁with ▁three ▁pan els ▁now ▁in ▁the ▁Capit oline ▁Museum , ▁the ▁relief s ▁were ▁probably ▁taken ▁from ▁a ▁tri um phal ▁monument ▁comm emor ating ▁Marcus ▁A ure lius ' ▁war ▁against ▁the ▁Mar com anni ▁and ▁the ▁S arm ati ans ▁from ▁ 1 6 9 ▁– ▁ 1 7 5 , ▁which ▁ended ▁with ▁Marcus ▁A ure lius ' ▁triumph ant ▁return ▁in ▁ 1 7 6 . ▁On ▁the ▁larg it io ▁panel , ▁the ▁figure ▁of ▁Marcus ▁A ure lius ' ▁son ▁Com mod us ▁has ▁been ▁er adic ated ▁following ▁the ▁latter ' s ▁dam nat io ▁mem oria e . ▁ ▁From ▁the ▁same ▁time ▁period ▁the ▁two ▁large ▁( 3   m ▁high ) ▁pan els ▁decor ating ▁the ▁att ic ▁on ▁the ▁east ▁and ▁west ▁sides ▁of ▁the ▁arch ▁show ▁scenes ▁from ▁Tra jan ' s ▁Da cian ▁Wars . ▁T ogether ▁with ▁the ▁two ▁relief s ▁on ▁the ▁inside ▁of ▁the ▁central ▁arch way , ▁these ▁came ▁from ▁a ▁large ▁fr ie ze ▁celebr ating ▁the ▁Da cian ▁victory . ▁The ▁original ▁place ▁of ▁this ▁fr ie ze ▁was ▁either ▁the ▁Forum ▁of ▁Tra jan , ▁or ▁the ▁bar ra cks ▁of ▁the ▁em peror ' s ▁horse ▁guard ▁on ▁the ▁C ael ius . ▁ ▁Main ▁section ▁The ▁general ▁layout ▁of ▁the ▁main ▁fac ade ▁is ▁identical ▁on ▁both ▁sides ▁of ▁the ▁arch , ▁consisting ▁of ▁four ▁columns ▁on ▁bases , ▁div iding ▁the ▁structure ▁into