The Cathach of St. Columba, known as the Cathach, is a late 6th century Insular psalter. It is the oldest surviving manuscript in Ireland, and the second oldest Latin psalter in the world.

Insular script is a medieval script system originating from Ireland that spread to England and continental Europe under the influence of Irish Christianity. Irish missionaries took the script to continental Europe, where they founded monasteries such as Bobbio. The scripts were also used in monasteries like Fulda, which were influenced by English missionaries. They are associated with Insular art, of which most surviving examples are illuminated manuscripts. It greatly influenced modern Gaelic type and handwriting.