Cyril of Jerusalem (c. 313 – 386), theologian and bishop; Cyril of Alexandria (c. 376 – 444), Patriarch of Alexandria; Cyril the Philosopher (link to Saints Cyril and Methodius), 9th century Greek missionary, co-invented the Slavic alphabet, translated the Bible into Old Church Slavonic; Pope Cyril II of Alexandria reigned 1078–1092
The following are list of astronomers, astrophysicists and other notable people who have made contributions to the field of astronomy.They may have won major prizes or awards, developed or invented widely used techniques or technologies within astronomy, or are directors of major observatories or heads of space-based telescope projects.