Take the following as truth: The capital of the Gododdin was Din Eidyn (the  Fort of Eidyn,  almost certainly the Castle Rock), whose name lives on in the Edin- of Edinburgh.
Then the following statement: "Edinburgh was named for Din Eidyn because it was probably the Castle Rock, an important place in Gododdin." is true, false, or inconclusive?
Answer: Inconclusive