See Owen J. Blum, OFM Peter Damian Letters 31-60 (Washington D.C.: The Catholic University of America, 1990), 49 ("being an informer and delator of my brother's crimes")
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In 1073 during the episcopate of Pietro, Peter Damian went to Forlimpopoli to reform ecclesiastical disciplines, and on this occasion is thought to have delivered a sermon on St. Rufillus, which Vecchiazzani, an historian of this city, claims to have discovered at Rimini in the Library of St. Jerome.
The Book of Gomorrah is a book of ecclesiastical discipline written by Peter Damian in 1049.