Città del Vaticano, Archivio Apostolico Vaticano, Reg. Vat. 1
From Clavis Canonum
Città del Vaticano, Archivio Apostolico Vaticano (olim Archivio Segreto Vaticano), Reg. Vat. 1 is the copy of the (incomplete) register of John VIII that Abbot Desiderius of Montecassino had made around 1070. It contains 314 letters written between September 876 and August 882.
