The Nothii in the Founding of Braavos

The knowledge of Nat is very limited in Westeros and some of it may have been seeded by the Roynar actually going there some 600 years ago. And that's what led them to Dorne, right? But you wonder what they, the stories they would have told of Nat. It's kind of cool little world building tidbit. Now, you can tell that they were involved in the founding of Braavos. Why is that? Raw. How the double A, that was their contribution. We could need to just Braavos with the one A and the nothii representative. I don't really feel represented here.