A dominant interest has been the work of Gregory of Nazianzus (Gregory the Theologian) and he has been closely associated since the 1980s with the NAZIANZOS project of the University of Louvain-la-Neuve which he has directed for approximately a quarter of a century.
The texts which have appeared cover a wide range of authors including on a random selection Irenaeus of Lyons, Tertullian, Origen of Alexandria, Aphrahat, Gregory of Nazianzus, Ambrose, Gregory of Nyssa, Theodore of Mopsuestia, Cassiodorus, John Philopon, Abelard, Rupert of Deutz.
"'Religion' as the Cipher for Identity: The Cases of Emperor Julian, Libanius, and Gregory Nazianzus," Harvard Theological Review 93.4 (2000): 373–400.
Clement of Alexandria, John Chrysostom, and the Cappadocians (Basil of Caesarea and Gregory of Nazianzus especially) are strongly represented, but a section is also devoted to Western spiritual writers such as Bernard of Clairvaux.
Gregory Peck | Gregory of Tours | Order of St. Gregory the Great | Gregory Bateson | Pope Gregory VII | Gregory of Nyssa | Pope Gregory XIII | Pope Gregory XVI | Lady Gregory | Gregory S. Paul | Gregory Corso | Pope Gregory XV | Gregory of Nazianzus | Pope Gregory XI | Philippa Gregory | Gregory the Illuminator | Gregory Olsen | Gregory Blaxland | Dick Gregory | Pope Gregory I | Gregory Reinhart | Gregory Deyermenjian | Gregory Crewdson | Gregory Benford | Francis Thomas Gregory | Andre Gregory | Pope Gregory X | Pope Gregory VI | Jack Gregory | Gregory Thaumaturgus |
They are works by early Christian and Byzantine churchmen that would have been available to Kirill in Slavonic translations: John Chrysostom, Epiphanius of Salamis, Ephrem of Syrus, Gregory of Nazianzus, Eusebius of Caesarea, and the scholia of Nicetas of Heraclea, Titus of Bostra, Theophylact of Ohrid, and the chronicler George the monk (George Hamartolus).
Like its predecessor, The Nicene Faith is structured not only chronologically, but according theme, examining of only certain theologians-Athanasius, Basil of Cesarea, Gregory of Nazianzus, and Gregory of Nyssa.
Caesarius of Nazianzus, physician and politician of the 4th century, and the younger brother of Gregory of Nazianzus