ition ▁of ▁the ▁Republican ▁constitution ▁by ▁the ▁Med ici ▁on ▁their ▁return ▁to ▁the ▁city ▁in ▁ 1 5 3 0 . ▁Indeed , ▁in ▁the ▁ 1 5 th ▁century ▁the ▁post ▁was ▁given ▁to ▁many ▁members ▁of ▁the ▁Med ici ▁family ▁and ▁their ▁neighbour ing ▁and ▁al lied ▁families , ▁giving ▁them ▁a ▁kind ▁of ▁recogn ised ▁power ▁within ▁the ▁republic an ▁framework ▁and ▁de ▁fact o ▁( though ▁never ▁de ▁j ure ) ▁allowing ▁them ▁to ▁take ▁over ▁the ▁powers ▁of ▁the ▁other ▁old ▁mag istra cies . ▁ ▁After ▁the ▁exp ulsion ▁of ▁Pier o ▁the ▁Un fortun ate ▁in ▁ 1 4 9 4 ▁and ▁during ▁the ▁brief ▁rule ▁of ▁Gi rol amo ▁Sav on ar ola ▁( exec uted ▁in ▁ 1 4 9 8 ), ▁the ▁Flor ent ine ▁families ▁tried ▁to ▁re organ ise ▁the ▁city ▁government ▁on ▁the ▁model ▁of ▁the ▁old ▁commun al ▁mag istra cies . ▁Pier ▁S oder ini ▁was ▁in ▁ 1 5 0 2 ▁appointed ▁g on fal oni ere ▁for ▁life , ▁but ▁only ▁held ▁it ▁until ▁the ▁end ▁of ▁ 1 5 1 2 , ▁when ▁the ▁Med ici ▁returned ▁and ▁Pier o ▁decided ▁to ▁abandon ▁the ▁city . ▁During ▁his ▁ten ure , ▁S oder ini ▁held ▁more ▁direct ▁political ▁responsibility ▁than ▁either ▁Cos imo ▁de ' ▁Med ici ▁or ▁Lorenzo ▁de ' ▁Med ici . ▁Mach ia vel li ▁served ▁as ▁his ▁secretary . ▁Although ▁many ▁of ▁the ▁Ott im ati ▁or ▁arist ocr ats