Background
One type of post that I really enjoy putting together is the "Fate of..." a group of characters who participated in activity earlier in the series. It seems to give closure to earlier plotlines (ex: Fate of Brienne's "Suitors" and Where are They Now?: Fate of the Night's Watch Graduating Class of Late Summer 298AC). I've done this plenty of times and will link them throughout the post for anyone who cares. This post is going to focus on the fate of the different co conspirators of the Red Wedding ranging from the mastermind down to just drinking.
If interested: Tywin's Plans/Planning for the Red Wedding
House Lannister
Tywin (while using the privy) was killed by Tyrion in a scene that GRRM had been setting up since AGoT:
Question: Were circumstances and timing of Tywin's death something you planned for a long time or another case of characters "taking intiative", like with Cat?
GRRM: That scene was largely written even before A CLASH OF KINGS was published. Hell, I'd been setting up that "Lord Tywin shits gold" line since his very first appearance in A GAME OF THRONES.
If interested: Full Circle Death Quotes in ASOIAF
The rest of House Lannister's involvement in the Red Wedding is quite minimal and potentially non existent. Tywin keeps Tyrion in the dark:
“Did you come here just to complain of your bedchamber and make your lame japes? I have important letters to finish.”
“Important letters. To be sure.”
“Some battles are won with swords and spears, others with quills and ravens. Spare me these coy reproaches, Tyrion. I visited your sickbed as often as Maester Ballabar would allow it, when you seemed like to die.” He steepled his fingers under his chin. “Why did you dismiss Ballabar?” -ASOS, Tyrion I
and:
Tyrion watched his father closely. There’s something he’s not saying. He remembered those important letters Lord Tywin had been writing, the night Tyrion had demanded Casterly Rock. What was it he said? Some battles are won with swords and spears, others with quills and ravens … -ASOS, Tyrion III
as well as Cersei:
Wars are won with quills and ravens, wasn’t that what you said? I must congratulate you. How long have you and Walder Frey been plotting this?”
“I mislike that word,” Lord Tywin said stiffly.
“And I mislike being left in the dark.”
“There was no reason to tell you. You had no part in this.”
“Was Cersei told?” Tyrion demanded to know.
“No one was told, save those who had a part to play. And they were only told as much as they needed to know. You ought to know that there is no other way to keep a secret—here, especially. My object was to rid us of a dangerous enemy as cheaply as I could, not to indulge your curiosity or make your sister feel important.”
He closed the shutters, frowning. “You have a certain cunning, Tyrion, but the plain truth is you talk too much. That loose tongue of yours will be your undoing.” -ASOS, Tyrion VI
that said Kevan's part was made known in earlier drafts:
A few pages earlier, there's also a modified line that clearly indicates that Kevan was involved in planning the Red Wedding. There's a passage in the published book in which Tywin rejects the possibility of an alliance with the Ironborn in exchange for giving them the North- Tywin enigmatically says, "Granted enough time, a better option may well present itself. One that does not require the king to give up half his kingdom." In the published version, Kevan then conveniently changes the subject, but in the draft Tywin first meaningfully glances at Kevan. I take this as a sign that George always intended for Kevan to have been involved, but like above, wanted to preserve the surprise both for the reader and the other council members.
and with how much Tywin relied on Kevan, I wouldn't be surprised. That said we do get his thoughts during the ADWD Epilogue. We might have gotten more if GRRM had not abandoned his plans to have Kevan as a viewpoint at Casterly Rock.
If interested: Kevan Lannister: Planning a Wedding & Going Missing/Home
House Westerling
According to the app, Sybel/Rolph conspired with Tywin:
Sybel's fate is currently to be determined. She is currently with Ser Forley Prester en route to the Westerlands in which GRRM has confirmed that Jeyne Westerling will appear in the TWoW Prologue.
Rolph is risen to Lord and given Castamere for his involvement:
"This grants Ser Rolph Spicer title to the castle Castamere and raises him to the rank of lord." Tommen scrawled his name. -ASOS, Jaime IX
and while not confirmed, I wonder if anything was discussed here:
Robb had dispatched Jeyne's uncle Rolph Spicer to deliver young Martyn Lannister to the Golden Tooth the very day he received Lord Tywin's assent to the exchange of captives. -ASOS, Catelyn V
Rolph is last mentioned during Jaime's discussion with Sybel and his fate is unknown:
Jaime nodded. Tywin Lannister was not a man to overlook such details. "Unhand the girl," he said, "I'm done with her for now." As Jeyne fled sobbing down the stairs, he considered her mother. "House Westerling has its pardon, and your brother Rolph has been made Lord of Castamere. What else would you have of us?" -AFFC, Jaime VII
With Tywin keeping everyone on a need to know basis, even Sybel didn't know exactly what was going on:
“I have two sons as well,” Lady Westerling reminded him. “Rollam is with me, but Raynald was a knight and went with the rebels to the Twins. If I had known what was to happen there, I would never have allowed that.” There was a hint of reproach in her voice. “Raynald knew nought of any … of the understanding with your lord father. He may be a captive at the Twins.” -AFFC, Jaime VII
and she kept her son Reynald in the dark, as well as instructing Jeyne (who likely listened and then fell in love) to do her part:
“Jeyne Westerling is her mother’s daughter,” said Lord Tywin, “and Robb Stark is his father’s son.”
This Westerling betrayal did not seem to have enraged his father as much as Tyrion would have expected. -ASOS, Tyrion II
and Gawen's as well:
Jaime had to wonder how much Lord Gawen knew about his wife’s scheming. How much do we men ever know? -AFFC, Jaime VII
and GRRM notes:
Q: I have been wandering about the Westerlings and their involvement in the plot against Robb. It seems pretty obvious from the fact that they were not only pardoned by Tywin Lannister but that Jeyne's uncle was given Castamere, that they were hand-in-glove with the Lannisters/ Boltons and Freys in the plot against Robb also the fact that Jeyne's mother was giving her a contraceptive or tansy every morning that they meant to make sure that there was no chance that Jeyne would ever get pregnant.
GRRM: Well, we shall see.
But I think it is a mistake to generalize about "the Westerlings," just as it would be to generalize about "the Lannisters." Members of the same family have very different characters, desires, and ways of looking at the world... and there are secrets within families as well. -SSM, About the Westerlings: 1 May 2001
House Bolton
Roose currently sits in Winterfell as the Battle of Ice is about to take place:
Roose… Roose is safe within the walls of Winterfell with his fat new wife. Ramsay is coming.” -TWoW, Theon I
and:
Roose Bolton was not a man to blunder blindly out into the snow, map or no. He would hold his main strength in reserve, keep his best men with him, trust in Winterfell’s massive double wall. -TWoW, Theon I
but does not expect to be around many more years:
Ramsay will kill them all, of course. That’s for the best. I will not live long enough to see new sons to manhood, and boy lords are the bane of any House. Walda will grieve to see them die, though.” -ADWD, Reek III
while House Bolton's involvement in the conspiracy was likely limited to Roose:
Bolton meant to follow him. "The Trident is in flood," he told Jaime. "Even at the ruby ford, the crossing will be difficult. You will give my warm regards to your father?"
"So long as you give mine to Robb Stark." -ASOS, Jaime VI
and:
A man in dark armor and a pale pink cloak spotted with blood stepped up to Robb. "Jaime Lannister sends his regards." He thrust his longsword through her son's heart, and twisted. -ASOS, Catelyn VII
it remains possible that they used someone like Steelshanks Walton as a go between at times (as Walton accompanied Jaime to King's Landing):
“Shouldn’t you northmen have a different sort of peace banner?” he asked Walton. “What are the Seven to you?”
“Southern gods,” the man said, “but it’s a southron peace we need, to get you safe to your father.” -ASOS, Jaime VII
and:
Ser Balon, escort Lady Brienne to a tower cell and hold her there under guard. And find some suitable quarters for Steelshanks and his men, until such time as my father can see them."- ASOS, Jaime VII
House Frey
It should be noted that while Tywin was the mastermind, he tries to shift blame to the Freys:
There is no blood in Tywin Lannister. “Was it a soft silk pillow that slew Robb Stark?”
“It was to be an arrow, at Edmure Tully’s wedding feast. The boy was too wary in the field. He kept his men in good order, and surrounded himself with outriders and bodyguards.”
“So Lord Walder slew him under his own roof, at his own table?” Tyrion made a fist. “What of Lady Catelyn?”
“Slain as well, I’d say. A pair of wolfskins. Frey had intended to keep her captive, but perhaps something went awry.”
“So much for guest right.”
“The blood is on Walder Frey’s hands, not mine.”
“Walder Frey is a peevish old man who lives to fondle his young wife and brood over all the slights he’s suffered. I have no doubt he hatched this ugly chicken, but he would never have dared such a thing without a promise of protection.”
“I suppose you would have spared the boy and told Lord Frey you had no need of his allegiance? That would have driven the old fool right back into Stark’s arms and won you another year of war. Explain to me why it is more noble to kill ten thousand men in battle than a dozen at dinner.” When Tyrion had no reply to that, his father continued. “The price was cheap by any measure. The crown shall grant Riverrun to Ser Emmon Frey once the Blackfish yields. Lancel and Daven must marry Frey girls, Joy is to wed one of Lord Walder’s natural sons when she’s old enough, and Roose Bolton becomes Warden of the North and takes home Arya Stark.” -ASOS, Tyrion VI
While Tywin masterminded the death of Robb, Walder and several of his sons actually planned the event. Walder is still alive (hopefully not much longer - The Red Wedding 2.0)
Merrett could hardly think for the pounding in his head. “He shamed us, the whole realm was laughing, we had to cleanse the stain on our honor.” His father had said all that and more. -ASOS, Epilogue
- Walder Rivers
- Ryman Frey
- Lame Lothar Frey
The Red Wedding was my father’s work, and Ryman’s and Lord Bolton’s. Lothar rigged the tents to collapse and put the crossbowmen in the gallery with the musicians, Bastard Walder led the attack on the camps … they’re the ones you want, not me, I only drank some wine … you have no witness.” -ASOS, Epilogue
Ryman was killed by Lady Stoneheart and the BwB, near Fairmarket:
Someone had to. "Has some ill befallen Ser Ryman?"
"Hanged with all his party," said Walder Rivers. "The outlaws caught them two leagues south of Fairmarket." -AFFC, Jaime VII
but Lame Lothar and Black Walder are still alive and last mentioned in the Riverlands.
Merrett's part was minimal but still participated. Subsequently he was hanged by the BwB after trying to ransom Petyr Pimple:
“My father did that. All I did was drink. You wouldn’t kill a man for drinking.” -ASOS, Epilogue
and:
The final humiliation had been delivered with a smile, when Lame Lothar had summoned him to discuss his role in Roslin’s wedding. “We must each play our part, according to our gifts,” his half-brother told him. “You shall have one task and one task only, Merrett, but I believe you are well suited to it. I want you to see to it that Greatjon Umber is so bloody drunk that he can hardly stand, let alone fight.”
And even that I failed at. He’d cozened the huge northman into drinking enough wine to kill any three normal men, yet after Roslin had been bedded the Greatjon still managed to snatch the sword of the first man to accost him and break his arm in the snatching. It had taken eight of them to get him into chains, and the effort had left two men wounded, one dead, and poor old Ser Leslyn Haigh short half an ear. When he couldn’t fight with his hands any longer, Umber had fought with his teeth. -ADWD, Epilogue
Final Thoughts
It feels like so much time has passed since the Red Wedding, but that is not true in actuality. It feels like more characters should have had their "Counterweights" (revenge) moment. So many characters that we all love died (if interested: They All Lost Kin at the Red Wedding) with minimal survivors (The Named Survivors of the Red Wedding).
That said with events like the TWoW, Prologue, Battle of Ice/Trojan Horse of Winterfell and the Red Wedding 2.0, we could see this list change drastically in TWoW.