Gregory, I, Pope, approximately 540–604: Registrum epistolarum [Latin]
- Bibliography:
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- CPL 1714
- CCSL 140A (1982)
- PL 77
- Manuscripts:
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- MS. Add. C. 108 (Digital facsimile online) — 15th century, second half; German
- MS. Bodl. 193 (Selected pages online) — c. 1100; English; French, Normandy
- MS. Bodl. 809 — Composite manuscript
- MS. Digby 214 (Selected pages online) — 12th century, middle; English, Reading
- MS. Holkham misc. 19 — 12th century, early; Italian, Pistoia
- MS. Lat. bib. d. 6 — 12th century, first half; French
- MS. Laud Misc. 233 — Composite manuscript
- MS. Laud Misc. 421 (Digital facsimile online) — 9th century, end; Germany, West
- MS. Laud Misc. 449 (Digital facsimile online) — c. 1100; additions, 12th century, second half; French, North-west (?)
- St John's College MS. 63 — s. xii / xiii; England
- St John's College MS. 75 — Composite manuscript
The above references reflect only the current coverage of the online catalogue and may not be comprehensive.