[Coldsaturn]

There were no other mentions of lives spent under the sea with Raf beside GoT at the time. Which makes similar details mentioned in both connect them loosely (because it's not as strong as a direct quote, of course).

"This is the melody my beloved adores the most. Back then, I would often play it on my flute beneath her /window/, serenading her to sleep."
"I kissed your fingertips /beneath the window/ after, and you just laughed, humming some random song... And you're sometimes a bit out of tune."

GoT (from Sapphire Scar, one of the two 4-star cards set in the GoT timeline)
"Elder Amund expressed his grievances today. He said you stacked seven or eight turtles in your attempt to climb /out the window/"

With this new myth, the connection to the Witch and GoT is explicit, and they create this kind of chain of references that automatically puts them in order.