It dates from the 16th century.
“This fascinating little manuscript is from our collection of books and MS in the Benjamin Iveagh Library at Farmleigh, gifted to Marsh’s by the Guinness family”
This was posted a few days ago on the Archbishop Marsh’s Library site.
In a beautiful hand…………so easy to read.

https://docs.google.com/file/d/0B6hnQGE3ANjzOVdRVklmNGlKQmc0dGs4enVnV2txS3JRZEIw/edit