Callistus II, Saint, Patriarch of Constantinople, active 14th century & Ignatius Xanthopulus, ca. 1397/1400: Methodus et Regula, seu Centuria (opuscula Ascetica, Auctoribus Callisto Atque Ignatio Xanthopulis) [Greek]
- Bibliography:
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- PG 147.636–812
- External links:
- Manuscripts:
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- MS. Holkham Gr. 74 — 16th century
- MS. Holkham Gr. 75 — 16th c. (fols 1–112) and 17th c. (fols 114–215v, colophon: 28 March 1610, see Scribes, fols 114–259.; Crete, Monastery of St Antonios Apezanon (fols. 114r-225v)
The above references reflect only the current coverage of the online catalogue and may not be comprehensive.