| Common name of letter | Registrum I, 1* | ||||||
| Pages in Caspar's edition | from 1 to 2 (â–ºdMGH) | ||||||
| Type of document | other | ||||||
| Abstract (from Caspar's edition) | Official protocol of the election of Gregory VII. | ||||||
| Place of issue | Rome | ||||||
| Date of issue | 1073 April 22 | ||||||
| Incipit | REGNANTE DOMINO NOSTRO Iesu Christo, anno clementissimae incarnationis... | ||||||
| Datum line | Acta Rome X Kalendas Maii Indictione XI | ||||||
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