From A Wiki of Ice and Fire
Ygg is a legendary demon tree who fed on human flesh. According to legend, the Grey King carved the first longship from Ygg's hard pale wood. It may be that the legend of Ygg was inspired by a weirwood tree, as the First Men of old hung the entrails of the condemned in the branches of heart trees.
- ↑ The World of Ice & Fire, The Iron Islands: Driftwood Crowns.
- ↑ A Dance with Dragons, Chapter 29, Davos IV.