Raban Maur (right) presents his work to Pope Gregory IV (middle). Austrian National Library, Cod. 652, f. 2. Hrabanus Maurus, 'De Laude Crucis': Hrabanus...
Source https://digital.onb.ac.at/RepViewer/viewer.faces?doc=DTL_7223619 Other versions extract from File:Gregory-IV_Raban-Maur.jpg...
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