So I have a question for the real medievalists. I'm used to figuring the new year at Lady Day, March 25th, for early modern texts. But the fourth stanza (line 60) of Gawain begins
The year being so young that yester-even saw its birth (Tolkein)
Wyle Nw yer wats so yeth that hit watz nwe cummen(Davis, 2nd ed; I've transliterated the yoghs to "y" and the thorns to "th" because I don't play with a full deck, so to speak).
The poem is clearly set at Christmas, so what's with the year being new thing?
Did they count the new year at January first, Lady Day, or both? Or at some point, did the new year move to Lady Day (and then back again, in 1752)?