 The seminal work attributing these nuns to the scriptorium at Chelles is written by Bernhard Bischoff.He compared certain texts to other books written in the same minuscule and located them at Chelles between c.785 and 810, at the time when Gisèla was abbess.The nuns’ surviving texts include parts of the Cologne manuscripts of Augustine’s Commentary on the Psalms (Dombibliothek 63, 65 and 67), Eusebius’ Ecclesiastical History, a fragment of Isidore of Seville’s Etymologiae and various other works by the bishop, as well as a copy of the Dialogues of Gregory the Great and a fragment of his Homilia in evangelium.