Sir Kay and the Salmon of Llyn Llyw, from the tale of Culhwch and Olwen. In the old Celtic tales, Cei Hir had magical powers. Among other things, he could hold his breath for 9 nights and days under water. That is certainly convenient when socialising with giant salmon.
thanks for clearing all that stuff up! But now I have another question: What was the deal with Dafydd? And what happened to that one guy, I think his name was uh, Llywelyn? (I really hope I spelled that right, and I'm sorry if I'm bothering you in any way, I don't know a ton about Wales and I think your discussions are interesting.)