A nursery rhyme.
This is Celtic style calligraphy with the text in “Insular miniscule” derived from some of the marginal text in the “Book of Kells” and the decoration on the letters exaggerated slightly.
The magiscules are of Celtic style too (keep it all balanced) with zoomorphic letters (they have animal heads, within a knot work border.
There is a spelling mistake.
The original is A4 210*298 mm.