ollaimh, do you have a reference for the dating of the Wexford Carol? Beautiful song. It was collected by WH Grattan Flood, who wasn't born until 1857. I've heard claims that this (and some other songs) 'go back to [insert century]', but without any reference to back up the claim. Tomorrow Shall Be My Dancing Day is one such example that is claimed as that vague term 'mediaeval' (that covers 1,000 years!), but I can find no evidence either song goes back further than the 19th century. I'd be more than happy to be pointed towards the relevant dated mss.