▁G is è la ▁was ▁particularly ▁famous ▁for ▁her ▁intelligence ▁and ▁learning , ▁and ▁for ▁demand ing ▁several ▁books ▁and ▁bib lic al ▁comment aries ▁for ▁the ▁monaster y ’ s ▁library . ▁The ▁n uns ▁owned , ▁or ▁at ▁least ▁had ▁access ▁to , ▁the ▁Ann ales ▁reg ni ▁Fran cor um ▁and ▁Cont inu ation es ▁Fre deg ari i , ▁which ▁were ▁and ▁both ▁remain ▁significant ▁sources ▁for ▁history - writing . ▁ ▁The ▁monaster y ▁hous ed ▁an ▁important ▁script or ium , ▁involving ▁a ▁cons ort ium ▁of ▁at ▁least ▁nine ▁n uns ▁as ▁scri bes . ▁The ▁manuscript s ▁that ▁surv ive ▁are ▁not ▁ill umin ated , ▁yet ▁Ch elles ▁Ab bey ▁is ▁particularly ▁strongly ▁linked ▁with ▁the ▁creation ▁of ▁a ▁unique ▁script ▁style . ▁Jane ▁Stevens on ▁bel ieves ▁there ▁were ▁around ▁four teen ▁n uns ▁in ▁an ▁‘ atel ier ’ , ▁working ▁under ▁a ▁nun ▁master - scribe , ▁and ▁describes ▁Ch elles ▁as ▁one ▁of ▁the ▁most ▁product ive ▁script oria ▁of ▁the ▁e ighth ▁and ▁nin th ▁centuries ▁and ▁therefore ▁a ▁significant ▁nucle us ▁of ▁intellectual ▁activity . ▁The ▁sem inal ▁work ▁att rib uting ▁these ▁n uns ▁to ▁the ▁script or ium ▁at ▁Ch elles ▁is ▁written ▁by ▁Bern hard ▁B isch off . ▁He ▁compared ▁certain ▁texts ▁to ▁other ▁books ▁written ▁in ▁the ▁same ▁min usc ule ▁and ▁located ▁them ▁at ▁Ch elles ▁between ▁c . 7 8 5 ▁and ▁ 8 1 0 , ▁at ▁the ▁time ▁when