Known historically as "Phos Hilaron", "Gladsome Light" is the oldest known hymn in Christianity. It is known as a 'lamp-lighting' hymn, sung before sunrise. Today it can be heard every Saturday during the Vespers services of the Orthodox Church.
LINKS:
Hear the full rendition of "O Gladsome Light" used in the opening (used with permission from the Whitfield family):    • O Gladsome Light (Byzantine)  
Another wonderful version:    • O Gladsome Light  
A short article on "Gladsome Light" along with some helpful teaching about it: https://www.oca.org/liturgics/outline...
Another short article on Phos Hilaron: https://lychnos.org/o-gladsome-light/
Another article on the hymn, which also points out that it may have been written by someone else entirely and not Athenogenes: https://en.orthodoxwiki.org/Phos_Hilaron
An article on "what is a vespers service": https://www.nativityorthodoxchurch.co...
A video by Matushka Frederica on Vespers:    • The Vespers Service in the Orthodox C...  
Haven't played Civilization 6 but apparently Phos Hilaron is the theme for Byzantium:    • Byzantium Ambient - Phos Hilaron (Civ...  

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