When I first came across The Grand Northern Conspiracy, I had been doing what most fans of the show and books do during their down time: I was Googling Game of Thrones / A Song of Ice and Fire theories. After only minutes of sifting through the various tinfoil hat theories (super-crazy fan ideas), I came across The Grand Northern Conspiracy (TGNC), and was instantly enthralled.
Since then, I have tried to find the original author of TGNC, but have had no real luck. I do know, however, that the theory originated on Westeros.org, one of the oldest and most reliable Game of Thrones/A Song of Ice and Fire websites around. I originally came across it when snooping around the ASOIAF subreddit. The original poster (OP) on the subreddit even gave credits to Westeros.org, and laid the theory out nicely on a Tumbler page called ASOIAF University.
The Grand Northern Conspiracy is divided into seven parts, but before we get into that, let’s quickly go over the key players and events leading up to the North’s bid to reinstate the Starks in Winterfell.
The Grand Northern Conspiracy revolves around the idea that the citizens of the North are enraged after Lord Walder Frey, together with Lord Roose Bolton, killed Robb Stark, Catelyn Stark, and Robb’s men at the Red Wedding, even though they should have been protected by guest right (the tradition which protects guests from harm so long as they’ve partaken of salt and bread from their host).