Irish Epic Visionary Poems

Visionary poems, or visionary tales of a character having a vision of another world, is aa tradition in irish story telling. But what makes this one special is that it was written down five years before the norman invasion of ireland. The pope wanted to introduce gregorian reforms which was britain gets the take over ireland so that you can make irish christianity more in line with rome. Story thats visiotognal. It's it's reject your mythology, reject the past of ireland and repent and become proper christians. That's what heronimus bash tie into this?