Even though Ireland was resistant to RCC authority, post council of whitby up to Gregory VII, they used Latin as primary language in writing. Evidence of Celtic lang use in writing or on grave stones etc. among christians is rare after 7-8 th century from what I have read. Writing of any kind from this era is very rare. New scholarship in the last few years may have uncovered a different story.

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Scott McManus
Attending Hillcrest Church
RTS Charlotte - MA Distance
Dallas TX