This image is from the book of Cerne, an ancient Celtic Christian text featuring Gospel extracts, Pslams, hymns, prayers and an apocryphal “Harrowing of Hell”.
It was used by the ancients for private prayers and devotions.
Shown here is the opening of the Gospel of Luke, featuring an image of Luke above his symbol, the Ox.
Curious Christian 
You sure that’s an ox?
Looks more like St Mark’s lion to me!
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Silly me. I got a bum steer from a university but should have spotted that error for myself. Now corrected Steve!
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Dem claws, dem claws, dem sharp claws, now hear the word of the Lord!
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