Pseudo-Isidore's main object was to provide accused bishops with an array of legal protections amounting to de facto immunity from trial and conviction; to secure episcopal autonomy within the diocese; and to defend the integrity of church property.
Pseudo-Isidore was also heir to a long tradition of Carolingian church reform, and his forgeries also include a wide array of themes reflecting Frankish liturgical, doctrinal, educational and administrative aspirations.
These include the Capitula Angilramni, a brief collection on criminal procedure allegedly given to Bishop Angilram of Metz by Pope Hadrian I; and a series of excerpts from the Rusticus version of the Council of Chalcedon.
[5] Klaus Zechiel-Eckes claims that Pseudo-Isidore did important research at the library of the monastery of Corbie, in the Reims suffragan diocese of Amiens.
[10] The final proof of forgery was provided by Calvinist preacher David Blondel, who discovered that the popes from the early centuries quoted extensively from much-later authors and published his findings (Pseudoisidorus et Turrianus vapulantes) in 1628.