| Common name of letter | Registrum I, 21a | ||||
| Pages in Caspar's edition | from 35 to 36 (â–ºdMGH) | ||||
| Type of document | Oath | ||||
| Abstract (from Caspar's edition) | Oath of fealty by Prince Richard of Capua towards Gregory VII. | ||||
| Place of issue | Capua | ||||
| Date of issue | 1073 September 14 | ||||
| Incipit | Ego Richardus Dei gratia et sancti PETRI Capuae princeps ab hac hora et deinceps... | ||||
| Datum line | Actum Capuae XVIII Kalendas Octobris Indictione XII | ||||
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