ace . ▁It ▁is ▁located ▁on ▁Via ▁di ▁Sant ' E ust ach io ▁in ▁the ▁r ione ▁Sant ' E ust ach io , ▁a ▁block ▁west ▁of ▁the ▁P ant he on ▁and ▁via ▁della ▁Rot onda , ▁and ▁a ▁block ▁east ▁of ▁Sant ' I vo ▁alla ▁S ap ienza ▁and ▁the ▁Via ▁della ▁Dog ana ▁Vec chia . ▁ ▁History ▁ ▁A ▁church ▁at ▁the ▁site ▁was ▁founded ▁by ▁the ▁ 8 th ▁century . ▁The ▁church ▁was ▁recorded ▁as ▁a ▁dia con ia ▁( a ▁centre ▁for ▁helping ▁the ▁poor ▁and ▁the ▁sick ) ▁at ▁the ▁end ▁of ▁the ▁pont ificate ▁of ▁Pope ▁Gregory ▁II ▁( 7 1 5 - 7 3 1 ). ▁It ▁is ▁mentioned ▁in ▁some ▁documents ▁d ating ▁from ▁the ▁ 1 0 th ▁and ▁ 1 1 th ▁centuries , ▁where ▁this ▁church ▁is ▁called ▁in ▁plat ana ▁( between ▁the ▁plane ▁trees ) ▁referring ▁to ▁the ▁tree ▁plant ed ▁in ▁the ▁garden ▁of ▁the ▁mart yr ▁E ust ace . ▁However , ▁tradition ▁holds ▁that ▁the ▁em peror ▁Const antine ▁I ▁had ▁previously ▁built ▁an ▁or atory ▁here . ▁This ▁church ▁was ▁called ▁" ad ▁P ant he on ▁in ▁reg ione ▁non a ▁e ▁i u xt a ▁tem pl um ▁Ag ri pp ae " ▁( at ▁the ▁P ant he on ▁in ▁the ▁nin th ▁region ▁and ▁next ▁to ▁the ▁temple ▁of ▁Ag ri ppa "). ▁ ▁The ▁church ▁was ▁restored ▁and ▁had ▁a ▁new ▁camp an ile ▁added