A worn vellum page of the late-sixth-century Cathach psalter, written in Insular majuscule script, with an enlarged decorated initial beginning a psalm.
A folio of the Cathach of St Columba — the oldest surviving Irish manuscript, a late-sixth-century psalter in Insular majuscule. By tradition it is the copy Columba made, in secret, of Finnian’s book; in the quarrel that followed, King Diarmait is remembered as ruling “to every cow her calf, to every book its copy” — often called the earliest judgment on the right to copy. That account is tradition, not record — a well-loved authority the careful reader must still check, the discipline this whole course is built on. In an age of machines that copy and recombine text at scale, the old question only sharpens: whose words are these, and where is the original? Source: Wikimedia Commons · public domain.

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