▁histor ically ▁assumed ▁that ▁some ▁or ▁all ▁of ▁the ▁b ish ops ▁identified ▁in ▁the ▁canon ▁were ▁pres iding ▁over ▁their ▁own ▁dioc eses ▁at ▁the ▁time ▁of ▁the ▁Council — the ▁Bishop ▁of ▁Rome ▁over ▁the ▁Dioc ese ▁of ▁Italy , ▁as ▁Sch aff ▁suggested , ▁the ▁Bishop ▁of ▁Ant io ch ▁over ▁the ▁Dioc ese ▁of ▁Ori ens , ▁as ▁L ough lin ▁suggested , ▁and ▁the ▁Bishop ▁of ▁Alexand ria ▁over ▁the ▁Dioc ese ▁of ▁Egypt , ▁as ▁suggested ▁by ▁Karl ▁Josef ▁von ▁He fe le . ▁According ▁to ▁He fe le , ▁the ▁Council ▁had ▁assigned ▁to ▁Alexand ria , ▁" the ▁whole ▁( c ivil ) ▁Dioc ese ▁of ▁Egypt ." ▁Yet ▁those ▁assumptions ▁have ▁since ▁been ▁proven ▁false . ▁At ▁the ▁time ▁of ▁the ▁Council , ▁the ▁Dioc ese ▁of ▁Egypt ▁did ▁exist ▁but ▁was ▁known ▁as ▁the ▁Dioc ese ▁of ▁Alexand ria ▁( Est ab lished ▁by ▁St ▁Mark ▁in ▁the ▁ 1 st ▁Century ), ▁so ▁the ▁Council ▁could ▁have ▁assigned ▁it ▁to ▁Alexand ria . ▁Ant io ch ▁and ▁Alexand ria ▁were ▁both ▁located ▁within ▁the ▁civil ▁Dioc ese ▁of ▁Ori ens , ▁Ant io ch ▁being ▁the ▁chief ▁metropol is , ▁but ▁neither ▁admin ister ed ▁the ▁whole . ▁Like wise , ▁Rome ▁and ▁Milan ▁were ▁both ▁located ▁within ▁the ▁civil ▁Dioc ese ▁of ▁Italy , ▁Milan ▁being ▁the ▁chief ▁metropol is , ▁yet ▁neither ▁admin ister ed ▁the ▁whole . ▁ ▁This ▁ge ographic ▁issue ▁related ▁to ▁Can on ▁ 6 ▁was