Celtic Religion - what information do we really have

http://campus.murraystate.edu/academic/faculty/tsaintpaul/celtreli.html

we have the Insular literature, including early British histories (like those of Nennius and Geoffrey of Monmouth), sociopolitical geographies like those of Giraldus Cambrensis as

Rome and Romania, Roman Emperors, Byzantine Emperors, etc.

https://friesian.com/romania.htm

alone (all of) Greek literature, was not preserved at Rome, but at Constantinople :  the "City of Constantine," ἡ Κωνστα

That's everything I could find.
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