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In page Goidelic languages:

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The oldest written Goidelic language is Primitive Irish, which is attested in Ogham inscriptions from about the 4th century. The forms of this speech are very close, and often identical, to the forms of Gaulish recorded before and during the time of the Roman Empire.[citation needed] The next stage, Old Irish, is found in glosses (i.e. annotations) to Latin manuscripts—mainly religious and grammatical—from the 6th to the 10th century, as well as in archaic texts copied or recorded in Middle Irish texts. Middle Irish, the immediate predecessor of the modern Goidelic languages, is the term for the language as recorded from the 10th to the 12th century; a great deal of literature survives in it, including the early Irish law texts.