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When were the earliest Irish ogham inscriptions made?
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Celtic literature
Britannica editor Jeff Wallenfeldt provides an overview of the Irish language.
The earliest ogham inscriptions are generally dated to the 4th century CE. While some sources associate the script with the 5th and 6th centuries, the inscriptions are of significant linguistic interest because they provide evidence of an earlier state of the Irish language than any other available source. These inscriptions, typically found on stone monuments, usually consist of a name and a patronymic.12