The version quoted by Fiolar is almost identical to a broadside in the Bodleian Collection (Harding B 26(35), P. Brereton, Dublin., c. 1867. First line of second verse starts Ah how I love to muse ...; Fiolar has How I long for to muse...; this is the only difference outside of a few spelling variations.
A second copy (Firth b25(11)) again is the same but for a word or two, same printer but different Dublin address, also c. 1867.

In any case, this version seems to be the oldest in print. Fiolar, I presume your "1000 years...") is the one edited by Kathleen Hoagland.