"Oh, you'd be astonished at what a boy can make of a few lies, fifty pieces of silver, and a drunken septon. I dared not bring my bride home to Casterly Rock, so I set her up in a cottage of her own, and for a fortnight we played at being man and wife. And then the septon sobered and confessed all to my lord father."

By now, I am sure most of you are well aware of the Tysha = Sailor's Wife theory.

The theory states that after her marriage to Tyrion and subsequent gang rape and humiliation she was sent "wherever whores go" which easily could be interpreted to be Braavos:

In Braavos men and women from far-flung corners of the world may sit together, as they have done for hundreds of years, eating and drinking and telling tales. All are welcome in the Secret City, it is said. -TWOIAF, The Free Cities: Braavos

There is plenty of potential evidence for the theory that is readily discussed:

• Golden Haired Daughter named Lanna (feminine form of Lann which is the founder of House Lannister)
• Lanna is the right age
• Speaks common tongue
• A "sadness about her"
• Makes all of her customers marry her

Counterarguments:

• First husband was lost at sea (Gerion?) when she was 14 (Lanna potentially rules out Gerion unless he lied)
• Yna tasted her blood and says her husband is dead

There are a few others I am potentially forgetting off the top of my head, but the reason for the post today is not the Sailor's Wife, but the guy sometimes performing the weddings . . . Septon Eustace

Septon Eustace

I am going to argue that Septon Eustace was the one who married Tyrion/Tysha

We know so little about him, except he used to be a Septon at the Sept beyond the Sea:

Dareon had once wed the Sailor's Wife, who would only bed with men who married her. The Happy Port sometimes had three or four weddings a night. Often the cheerful wine-soaked red priest Ezzelyno performed the rites. Elsewise it was Eustace, who had once been a septon at the Sept-Beyond-the-Sea. If neither priest nor septon was on hand, one of the whores would run to the Ship and fetch back a mummer. Merry always claimed the mummers made much better priests than priests, especially Myrmello. -AFFC, Cat of the Canals

The Sept Beyond the Sea is only used by Westerosi sailors:

"All gods are honored in Braavos." The captain's son loved to talk about his city almost as much as he loved to talk about his father's ship. "Your Seven have a sept here, the Sept-Beyond-the-Sea, but only Westerosi sailors worship there." -AFFC, Arya I

Other "possible" evidence:

• Eustace is a common name in southern Westeros
• A drunken septon performed Tyrion/Tysha's marriage, its possible that Eustace was forced to flee after admitting what he had done.

Not a ton of evidence for this theory, but when I saw there was a "disgraced" septon marrying the Sailor's Wife sometimes, I thought it was at least worth discussing.

TLDR: Septon Eustace is a drunk who married Tysha/Tyrion and then fled with her to Braavos where she is now the Sailor's Wife (or not), but he began working at the Sept Beyond the Sea and was removed for his alcoholism. Now when he is sober enough he marries the Sailor's Wife, but is not always available.