Hypothetically, each work can be allocated to one of several real Kirills and Cyrils: Cyril of Jerusalem (ca. 315-386); Cyril of Alexandria (d. 444); Cyril of Scythopolis (mid-sixth century); Constantine-Cyril, apostle of the Slavs(d. 869); Metropolitan Kirill I of Kiev (1223–1233); Metropolitan Kirill II of Kiev (1243–1290); Bishop Kirill of Rostov (1231–1262); Kirill of Turov.
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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).
Cyril of Alexandria | Cyril Wecht | Cyril Ramaphosa | Saints Cyril and Methodius | Cyril Clarke | Cyril | Cyril Scott | Cyril Newall, 1st Baron Newall | Cyril Connolly | Cyril Bibby | Cyril Ritchard | Cyril Davies | John Cyril Porte | Cyril Walsh | Cyril Toumanoff | Cyril Smith | Cyril Lowe | Cyril Hanouna | Cyril E. King Airport | Ss. Cyril and Methodius University of Skopje | Jean-Cyril Spinetta | Cyril Takayama | Cyril Rootham | Cyril Peacock | Cyril of Jerusalem | Cyril Newall | Cyril M. Kornbluth | Cyril Maude | Cyril Mango | Cyril Lord |