. ▁As ▁one ▁of ▁the ▁top - pla ced ▁Car lists ▁within ▁the ▁regime ▁Bil ba o ▁was ▁also ▁supposed ▁to ▁represent ▁Trad itional ist ▁roots ▁and ▁broad ▁political ▁ad her ence ▁to ▁the ▁regime . ▁ ▁Having ▁sat ▁ 3 5 ▁years ▁in ▁the ▁R esta ura ción ▁parliament , ▁the ▁Prim oder iver ista ▁As am ble a ▁Nacional , ▁the ▁republic an ▁Cort es ▁and ▁the ▁Franco ist ▁Cort es ▁Españ olas , ▁Bil ba o ▁remains ▁the ▁longest ▁serving ▁ 2 0 th ▁century ▁Spanish ▁deput y ▁and ▁one ▁of ▁the ▁longest ▁serving ▁Spanish ▁MP s ▁ever . ▁His ▁first ▁and ▁his ▁last ▁days ▁in ▁the ▁di et ▁are ▁sp anned ▁by ▁ 4 9 ▁years , ▁which ▁is ▁also ▁a ▁record ▁in ▁Spanish ▁parliament ary ▁history . ▁ ▁In ▁ 1 9 4 7 ▁he ▁was ▁the ▁key ▁author ▁of ▁Ley ▁de ▁Su ces ión , ▁the ▁law ▁which ▁officially ▁established ▁Spain ▁as ▁the ▁mon archy ▁and ▁opened ▁a ▁vague ▁path ▁for ▁royal ▁rest oration , ▁at ▁the ▁same ▁time ▁stabil izing ▁the ▁rule ▁of ▁Franco ▁as ▁J efe ▁de ▁Estado ; ▁it ▁was ▁protest ed ▁by ▁both ▁Alf ons ist ▁and ▁Car list ▁claim ants , ▁Don ▁Juan ▁and ▁Don ▁J avier . ▁According ▁to ▁the ▁law , ▁by ▁virtue ▁of ▁his ▁parliament ▁speaker ▁role ▁Bil ba o ▁entered ▁two ▁newly ▁established ▁bodies : ▁Conse jo ▁del ▁Reino ▁and ▁Conse jo ▁de ▁Reg encia . ▁The ▁former , ▁a ▁peculiar ▁di arch ic ▁structure ▁for ▁an ▁author