Gerion Lannister: what happened to Tyrion’s favourite uncle?

Tyrion Lannister’s favourite uncle was lost at sea eight years ago, on a quest to find a sword in Valyria. What happened to him? Is Gerion connected to Euron Greyjoy, the corsair king, or the Shrouded Lord? Is Gerion the father of the Sailor's Wife’s daughter, Lanna?
This video contains spoilers for the Game of Thrones show and books, including preview TWOW chapters.
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