Cyril,
Saint ( 376?-444); Christian theologian: archbishop of Alexandria (412-444): his day is June 27
Cyril,
Saint (born Constantine) ( 827?-869); Gr. prelate & missionary; apostle to the Slavs: his day is Feb. 14
See Cyril in American Heritage Dictionary 4
Cyr·il
Christian missionary and theologian who with his brother Saint Methodius (826-885) worked in Moravia, translating the Scriptures into Old Church Slavonic.