67. Sources. (Chapter 5. The Conflict of the Eastern and Western Churches and Their Separ...) (History of the Christian Church) (Schaff, Philip)

The chief sources on the beginning of the controversy between Photius and Nicolas are in Mansi: Conc. Tom. XV. and XVI.; in Harduin: Conc. Tom. V. Hergenroether: Monumenta Graeca ad Photium ejusque historiam pertinentia. Regensb. 1869.

I. On the Greek Side:

Photius: j Egkuvklio ejpistolhv etc. and especially his Lovgo peri; th' tou' a Jgivou Pneuvmato mustagwgiva, etc. See Photii Opera omnia, ed. Migne. Paris, 1860-'61, 4 vols. (Patr. Gr. Tom. CI.-CIV.) The Encycl. Letter is in Tom. II. 722-742; and his treatise on the mustagwgiva tou' a Jgivou Pneuvmato in Tom. II. 279-391.

Later champions:

Caerularius, Nicetas Pectoratus, Theophylact (12th century). Euyourmius Zigabenus, Phurnus, Eustratius, and many others. In recent times Prokopovitch (1772), Zoernicav (1774, 2 vols.).

II. On the Latin (Roman Catholic) Side:

Ratramnus (Contra Graecorum Opposita); Anselm of Canterbury (De Processione Spiritus S. 1098); Petrus Chrysolanus (1112); Thomas Aquinas (d. 1274), etc.

Leo Allatius (Allacci, a Greek of Chios, but converted to the Roman Church and guardian of the Vatican library, d. 1669): De ecclesiae occident. atque orient. perpetua consensione. Cologne, 1648, 4to.; new ed. 1665 and 1694. Also his Graecia orthodoxa, 1659, 2 vols., new ed. by Laemmer, Freib. i. B. 1864 sq.; and his special tracts on Purgatory (Rom. 1655), and on the Procession of the Holy Spirit (Rom. 1658).