▁to ▁the ▁civil ▁power ▁for ▁support ▁and ▁obtained , ▁from ▁Val entin ian ▁III , ▁a ▁dec ree ▁of ▁ 6 ▁June ▁ 4 4 5 , ▁which ▁recognized ▁the ▁prim acy ▁of ▁the ▁bishop ▁of ▁Rome ▁based ▁on ▁the ▁mer its ▁of ▁Peter , ▁the ▁dign ity ▁of ▁the ▁city , ▁and ▁the ▁legisl ation ▁of ▁the ▁First ▁Council ▁of ▁N ica ea ; ▁and ▁provided ▁for ▁the ▁for cible ▁extr ad ition ▁by ▁provincial ▁govern ors ▁of ▁any ▁bishop ▁who ▁refused ▁to ▁answer ▁a ▁summ ons ▁to ▁Rome . ▁Fac ed ▁with ▁this ▁dec ree , ▁Hil ary ▁submitted ▁to ▁the ▁po pe , ▁although ▁under ▁his ▁successor , ▁R aven nius , ▁Leo ▁divided ▁the ▁metropol itan ▁rights ▁between ▁Ar les ▁and ▁V ienne ▁( 4 5 0 ). ▁ ▁In ▁ 4 4 5 , ▁Leo ▁disput ed ▁with ▁Patri arch ▁Dios cor us , ▁Cy ril ▁of ▁Alexand ria ' s ▁successor ▁as ▁Patri arch ▁of ▁Alexand ria , ▁ins isting ▁that ▁the ▁ecc les iast ical ▁practice ▁of ▁his ▁see ▁should ▁follow ▁that ▁of ▁Rome ▁on ▁the ▁basis ▁that ▁Mark ▁the ▁Evangel ist , ▁the ▁dis ci ple ▁of ▁Peter ▁the ▁Apost le ▁and ▁the ▁founder ▁of ▁the ▁Alexand rian ▁Church , ▁could ▁have ▁had ▁no ▁other ▁tradition ▁than ▁that ▁of ▁the ▁prince ▁of ▁the ▁apost les . ▁ ▁The ▁fact ▁that ▁the ▁African ▁province ▁of ▁Ma ure t ania ▁Ca es ari ensis ▁had ▁been ▁preserved ▁to ▁the ▁emp ire ▁and ▁thus ▁to ▁the ▁Nic ene