Peter the Deacon
Deacon who attested as an eyewitness that the Holy Spirit sat upon Pope Gregory the Great in the form of a dove as he wrote.
Preface and Praise of Sacred Scripture
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Chapter V: On the Dispositions Required for This Study
— Attests as eyewitness that the Holy Spirit sat upon Gregory in the form of a dove as he wrote
"the eyewitness Peter the Deacon attests."