Pope Alexander IV (1199 or ca. 1185–1261), Pope from 1254 until his death
One of the earliest recorded members of the family was John de Chesehelme, who in 1254 was mentioned in a bull of Pope Alexander IV.
It was sponsored by King Louis and received the endorsement of Pope Alexander IV in 1259.
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Finally Pope Alexander IV condemned his writings and those of his follower Gerardo of Borgo San Donnino and set up a commission that in 1263 at the Synod of Arles declared Joachim's theories heretical.
The papal election of May 26–29 August 1261 took place after the death of Pope Alexander IV and chose Pope Urban IV as his successor.