2 ▁in ▁St . ▁Peter ' s ▁Bas il ica . ▁During ▁the ▁final ▁leg ▁of ▁his ▁journey , ▁from ▁Br ind isi ▁on ▁ 1 1 ▁January ▁ 1 2 7 2 , ▁Vis cont i ▁was ▁accompanied ▁by ▁Charles ▁of ▁An jou . ▁ ▁Leg acy ▁ ▁The ▁techniques ▁employed ▁against ▁the ▁dil atory ▁card inals ▁in ▁V iter bo ▁formed ▁the ▁basis ▁for ▁the ▁canon ▁law ▁of ▁pap al ▁conc la ves ▁as ▁laid ▁out ▁in ▁the ▁pap al ▁b ull ▁U bi ▁per icul um ▁of ▁Pope ▁Gregory ▁X , ▁prom ul g ated ▁during ▁the ▁Second ▁Council ▁of ▁Lyon ▁on ▁ 7 ▁July ▁ 1 2 7 4 . ▁Popular ▁accounts ▁of ▁the ▁conc lave , ▁as ▁early ▁as ▁those ▁of ▁French ▁historian ▁Georges ▁Go y au , ▁neglect ▁to ▁mention ▁the ▁political ▁intr igue ▁of ▁Charles ▁I ▁of ▁Nap les ▁or ▁his ▁nep hew , ▁Philip ▁III ▁of ▁France , ▁as ▁the ▁master m inds ▁of ▁the ▁hard ships ▁employed ▁by ▁the ▁" cit iz ens ▁of ▁V iter bo ." ▁ ▁Design ed ▁both ▁to ▁acceler ate ▁future ▁elections ▁and ▁reduce ▁outside ▁inter ference , ▁the ▁rules ▁of ▁U bi ▁per icul um ▁provide ▁for ▁the ▁cardinal ▁elect ors ▁to ▁be ▁se cluded ▁for ▁the ▁entire ty ▁of ▁the ▁conc lave , ▁including ▁having ▁their ▁me als ▁passed ▁through ▁a ▁small ▁opening , ▁and ▁for ▁their ▁r ations ▁to ▁be ▁reduced ▁to ▁a ▁single ▁me al ▁at ▁the ▁end ▁of ▁three ▁days , ▁or ▁bread ▁and