webeida,
I saw your question and cut and pasted it to the Tolkien Society. This is what they had to say in response to it. I hope this helps a bit.
Quote:
An interesting question. His biography says that he was an external examiner
for the Catholic University (based in Dublin) for many years, particularly
after World War 2, and that he travelled around Eire in the process. This
may mean that the University had branches in other cities (as it's hard to
see why he should have travelled otherwise). It doesn't go into more detail
than that, and the Letters mention nothing, which means that where he stayed
is not on record. He was not a student there, as he did not go to Eire till
1949 (Letter no. 165.) (It would be a slightly odd place to study ancient
English if he was based at Oxford, as Oxford is a major English language
study centre, and English is not part of the old Irish language.)His letters
show he was still visiting Ireland quite regularly as late as 1965, and no
doubt later. He said that he liked Ireland but (oddly enough) that the
language (by which he no doubt meant modern Irish, or Erse) did not appeal
to him. So he didn't care for the Irish language, but knew and liked Ireland
(because he went there on business), and liked the Welsh language very much,
but did not often get the opportunity to visit Wales. As for Scotland, he
visited it quite often (on work) but only the lowlands, and I don't recall
what if anything he felt about Gaelic. People who discern a "Celtic air" in
his work are only seeing what came through the myths, not the landscapes.
I hope that helps!