Viola Redwyne

"I wasn't originally meant to wed your grandfather Luthor you know, he was promised to my sister, your great-aunt Viola."

- Lady Olenna Tyrell Viola Redwyne is an unseen charater in the fourth season. She is the sister of Olenna Tyrell, aunt to Mace Tyrell, great-aunt to Margaery and Loras Tyrell, and was formerly bethrothed to Luthor Tyrell her future brother-in-law.

Season 4
Viola does not appear in the series, but is mentioned by her sister Olenna Tyrell, for being originally bethrothed to Olenna's late husband, Lord Luthor Tyrell. Olenna met Luthor after she left an embroidery lesson, and had stumbled upon Luthor's room, where they had, according to Olenna, sexual intercourse. The next morning, when Luthor was supposed to meet Viola, he did not turn up because he couldn't walk, and only wanted what Olenna had done to him the previous night.

In the books
Viola does not have a place in the books, but she may have been recreated from Lady Bethany Redwyne, who has an unknown relation to House Redwyne, and is the wife of Lord Mathis Rowan.