▁References ▁ ▁External ▁links ▁ ▁Category : T own s ▁in ▁T ian jin <0x0A> </s> ▁The ▁pap al ▁election ▁of ▁ 1 2 6 8 – 7 1 ▁( from ▁November ▁ 1 2 6 8 ▁to ▁ 1 ▁September ▁ 1 2 7 1 ), ▁following ▁the ▁death ▁of ▁Pope ▁Clement ▁IV , ▁was ▁the ▁longest ▁pap al ▁election ▁in ▁the ▁history ▁of ▁the ▁Catholic ▁Church . ▁This ▁was ▁due ▁primarily ▁to ▁political ▁inf ight ing ▁between ▁the ▁card inals . ▁The ▁election ▁of ▁Te ob al do ▁Vis cont i ▁as ▁Pope ▁Gregory ▁X ▁was ▁the ▁first ▁example ▁of ▁a ▁pap al ▁election ▁by ▁" comp rom ise ", ▁that ▁is , ▁by ▁the ▁appointment ▁of ▁a ▁committee ▁of ▁six ▁card inals ▁agreed ▁to ▁by ▁the ▁other ▁remaining ▁ten . ▁The ▁election ▁occurred ▁more ▁than ▁a ▁year ▁after ▁the ▁magistr ates ▁of ▁V iter bo ▁locked ▁the ▁card inals ▁in , ▁reduced ▁their ▁r ations ▁to ▁bread ▁and ▁water , ▁and ▁removed ▁the ▁roof ▁of ▁the ▁Pal azzo ▁dei ▁P api ▁di ▁V iter bo . ▁ ▁As ▁a ▁result ▁of ▁the ▁length ▁of ▁the ▁election , ▁during ▁which ▁three ▁of ▁the ▁twenty ▁cardinal - elect ors ▁died ▁and ▁one ▁res igned , ▁Gregory ▁X ▁prom ul g ated ▁the ▁pap al ▁b ull ▁U bi ▁per icul um ▁on ▁ 7 ▁July ▁ 1 2 7 4 , ▁during ▁the ▁Second ▁Council ▁of ▁Lyon , ▁establish ing ▁the ▁pap al ▁conc lave , ▁whose ▁rules ▁were ▁based ▁on ▁the