Sionnach! I have a t-shirt bearing an excerpt from this poem (secured at Trinity College)! Thanks for posting it here--don't believe I've ever seen the entire piece, and I love the phrase "turning darkness into light." :-)
Pangur Bán is an Old Irish poem, written in the 8th century in the area of the Reichenau abbey by an Irish monk about his cat. Although the poem is anonymous, it bears similarities to the poetry of Sedulius Scottus, leading to speculation that he might have been the author (Greene and O'Connor 1967). Pangur Bán, "white waulker", is the cat's name. In 8 verses of four lines, the author compares the cat's activities with his own scholarly pursuits.