This name is translated Canis Ultoniae, i.e. or Ulster Dog, anglicised Cowley and Cooley. Amongst the ancient Irish Dog was a designation of honour; to call a hero a Dog was as high a compliment as it would be to call him a lion at the present day. Accordingly we find in honour amongst them such names as Cu Midhe, dog of Meath; Cu Mumhan, dog of Munster; Cu Connacht, dog of Connacht; Cu Bladhma, dog of Slieve Bloom; Cu Caisil, dog of Cashel; Cu Sleibhe, dog of the mountain; Cu Maighe, dog of the plain, &c. &c.

From The Irish Charters in the Book of Kells (Author: [unknown]), p.147 (section 14.) Corpus of Electronic Texts Edition
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