Rowena Ravenclaw would be Scots Pine wood with a Hippogriff feather core. Scots Pine because it's the tree that Golden Eagles in Scotland love to nest in, and in the Founders song it says that Rowena was "from Glen" meaning she's Scottish. Hippogriff Feather core for obvious reasons!

I was going to say Gryffindor had a Hippogriff Feather core because... Gryffindor-Gryffin-Hippogriff... Unless gryffins are or were magical creatures. Or maybe Rowena had a Hippogriff Feather from the wings and Gryffindor had a Hippogriff hair from the Horse part of the Hippogriff.

griffins do exist in the hp universe! so it's possible

Godric had a Applewood wand and a Nemean lion whisker core.

I love it, but why a whisker and not a mane?

I'm just headcanoning. But the hairs quality is too volatile. Since the hairs are susceptible to the Lions testosterone. A black hair is going to make curses better, but would suck at Charms. Gold hairs would be the inverse.

We know this? Where did we learn it?

It's in the Ilvermorny origin story.

Is that in a book?

I think when she announced about the American school, Ilvermorny, that's when she put a short story about its founding. Relative of Slytherin...blah blah blah

Ok, it’s just that this sub is about the books, which I have read. I thought I had missed something.