In Irish myth, Newgrange is the home of Oengus Mac ind-Og, the Irish version of Mabon ap Modron. Keeping in mind the circumstances of the Winter Solstice as given above, it is possible that Oengus represents the reborn sun, as his Welsh counterpart Mabon does.

It is said that Oengus won Newgrange in a bet with his father the Dagda, but that Oengus had to relent and allow his father to live there some part of the year. Could this be a seasonal myth? And as the Dagda is identifiable in many respects with Bran the Fisher King, does this have a bearing on the Grail legend?