▁his ▁remains ▁were ▁moved ▁inside ▁the ▁bas il ica ▁itself . ▁ ▁Sign ific ance ▁ ▁Pope ▁Bened ict ▁XVI ▁said ▁that ▁Leo ' s ▁pap acy ▁"... was ▁und ou bt edly ▁one ▁of ▁the ▁most ▁important ▁in ▁the ▁Church ' s ▁history ." ▁ ▁The ▁significance ▁of ▁Leo ' s ▁pont ificate ▁lies ▁in ▁his ▁assertion ▁of ▁the ▁universal ▁juris diction ▁of ▁the ▁Roman ▁bishop , ▁as ▁expressed ▁in ▁his ▁letters , ▁and ▁still ▁more ▁in ▁his ▁ 9 6 ▁ext ant ▁or ations . ▁This ▁assertion ▁is ▁commonly ▁referred ▁to ▁as ▁the ▁doctrine ▁of ▁Pet r ine ▁supre m acy . ▁ ▁According ▁to ▁Leo ▁and ▁several ▁Church ▁F athers ▁as ▁well ▁as ▁certain ▁interpret ations ▁of ▁the ▁Script ures , ▁the ▁Church ▁is ▁built ▁upon ▁Peter , ▁in ▁purs u ance ▁of ▁the ▁promise ▁of ▁Matthew ▁ 1 6 : 1 6 – 1 9 . ▁Peter ▁particip ates ▁in ▁everything ▁which ▁is ▁Christ ' s ; ▁what ▁the ▁other ▁apost les ▁have ▁in ▁common ▁with ▁him ▁they ▁have ▁through ▁him . ▁What ▁is ▁true ▁of ▁Peter ▁is ▁true ▁also ▁of ▁his ▁success ors . ▁Every ▁other ▁bishop ▁is ▁charged ▁with ▁the ▁care ▁of ▁his ▁particular ▁f lock , ▁the ▁Roman ▁pont iff ▁with ▁that ▁of ▁the ▁whole ▁Church . ▁Other ▁b ish ops ▁are ▁his ▁assist ants ▁in ▁this ▁great ▁task . ▁In ▁Leo ' s ▁eyes ▁the ▁decre es ▁of ▁the ▁Council ▁of ▁Chal ced on ▁acquired ▁their ▁valid ity ▁from ▁his ▁confirm ation . ▁ ▁Leo