; ▁pres umably ▁Bon if ace ▁hoped ▁that ▁Can ter bury ▁( be ing ▁the ▁one - time ▁residence ▁of ▁August ine ) ▁possessed ▁an ▁authentic ▁copy ▁of ▁the ▁Lib ell us , ▁one ▁that ▁perhaps ▁preserved ▁more ▁ancient ▁read ings ▁than ▁the ▁copies ▁then ▁circul ating ▁in ▁France ▁and ▁Bav aria , ▁and ▁would ▁therefore ▁serve ▁as ▁a ▁correct ive ▁to ▁the ▁Cont inental ▁copies ▁and ▁the ▁inc est uous ▁nobles ▁who ▁re lied ▁upon ▁them . ▁Bon if ace ▁also ▁requested ▁N oth helm ' s ▁opinion ▁on ▁the ▁document ' s ▁authentic ity , ▁for ▁his ▁own ▁in qui ries ▁at ▁the ▁pap al ▁arch ives ▁had ▁failed ▁to ▁turn ▁up ▁an ▁official ▁" register ed " ▁copy ▁of ▁the ▁letter ▁there . ▁His ▁failed ▁attempt ▁to ▁locate ▁a ▁" register ed " ▁pap al ▁copy ▁of ▁the ▁Lib ell us ▁pres umably ▁suggested ▁to ▁Bon if ace ▁the ▁possibility ▁that ▁the ▁document ▁was ▁sp ur ious ▁and ▁had ▁in ▁fact ▁not ▁been ▁author ed ▁by ▁Pope ▁Gregory ▁I . ▁ ▁Bon if ace ▁had ▁specific ▁concerns ▁about ▁the ▁word ing ▁of ▁the ▁Lib ell us . ▁At ▁least ▁three ▁versions ▁of ▁the ▁Lib ell us ▁were ▁circul ating ▁on ▁the ▁Cont inent ▁during ▁Bon if ace ' s ▁lifetime , ▁all ▁of ▁these ▁within ▁collections ▁of ▁canonical ▁and ▁pen it ential ▁documents . ▁Bon if ace ▁is ▁known ▁to ▁have ▁encountered ▁( per haps ▁even ▁helped ▁produce ) ▁at ▁least ▁one ▁canon ▁law ▁collection ▁— ▁the ▁Collect io ▁canon