▁it ▁with ▁a ▁N omin ated ▁Assembly ▁( nick named ▁the ▁Parliament ▁of ▁Sain ts ▁and ▁B are bone ' s ▁Parliament ) ▁made ▁up ▁of ▁ 1 4 0 ▁nom ine es , ▁ 1 2 9 ▁from ▁England ▁and ▁Wales , ▁five ▁from ▁Scotland ▁and ▁six ▁from ▁Ireland . ▁It ▁proved ▁to ▁be ▁as ▁difficult ▁for ▁the ▁executive ▁to ▁work ▁with ▁this ▁parliament ▁as ▁it ▁had ▁with ▁the ▁R ump , ▁so , ▁after ▁sitting ▁for ▁five ▁months , ▁members ▁friendly ▁to ▁the ▁Grande es ▁eng ender ed ▁its ▁dissol ution ▁on ▁ 1 2 ▁December ▁ 1 6 5 3 . ▁ ▁The ▁Inst rument ▁of ▁Government ▁was ▁adopted ▁on ▁ 1 5 ▁December ▁ 1 6 5 3 ▁and ▁the ▁pre - em inent ▁Grande e ▁Oliver ▁C rom well ▁was ▁installed ▁as ▁Lord ▁Prote ctor ▁on ▁the ▁following ▁day . ▁The ▁Inst rument ▁of ▁Government ▁granted ▁executive ▁power ▁to ▁the ▁Lord ▁Prote ctor . ▁Although ▁this ▁post ▁was ▁elect ive , ▁not ▁her edit ary , ▁it ▁was ▁to ▁be ▁held ▁for ▁life . ▁It ▁also ▁required ▁the ▁calling ▁of ▁tri enn ial ▁Parliament s , ▁with ▁each ▁sitting ▁for ▁at ▁least ▁five ▁months . ▁ ▁In ▁January ▁ 1 6 5 5 , ▁C rom well ▁dissol ved ▁the ▁first ▁Prote ctor ate ▁Parliament , ▁us her ing ▁in ▁a ▁period ▁of ▁military ▁rule ▁by ▁the ▁Major ▁Gener als . ▁ ▁The ▁Inst rument ▁of ▁Government ▁was ▁replaced ▁in ▁May ▁ 1 6 5 7 ▁by ▁England