Game of Thrones: The Grand Northern Conspiracy

"In A Storm of Swords, Robb and Catelyn have a discussion about who should be Robb’s heir in the event that he dies without having fathered a son. Catelyn suggests a number of candidates, but Robb is sure of who he should name: his bastard brother Jon.

Before his death, so the theory goes, Robb Stark, as the King in the North, had papers drawn up and witnessed by his most trusted bannermen. We never find out all the details regarding the content of these papers, but in light of his talk with Catelyn, it stands to reason that they represented a will of 
sorts, a document that would legitimize Jon Snow in the event of Robb’s death. Robb did this so that, should he die during the War of Five Kings, Winterfell and the Wardenship of the North would pass to a Stark, rather than to any upstart usurpers like the Boltons.

The North remembers, and a certain Lord who happens to be too fat to sit a horse (Lord Wyman Manderly), is secretly leading a group of Stark loyalists who would see a Stark rule the North from Winterfell once again."

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Game of Thrones: The Grand Northern Conspiracy