Cregan Stark
Lord of Winterfell and Warden of the North, the Wolf of the North — a hard young lord of the old blood who keeps oaths the way his house keeps winter stores. The Pact of Ice and Fire is his price, and his word, once given, does not thaw.
A soul of House Stark, born at Winterfell, sworn to The Blacks — the Queen's Party.
The fuller tale
Season Two
In A Son for a Son — The Wolf of the North shows a southern prince what oaths mean up here. Jacaerys treats with Cregan Stark on the Wall itself: the North remembers its oath, and the Pact of Ice and Fire is sworn. In The Queen Who Ever Was — The Wolf of the North starts his long cold march. The realm draws up for the battles to come: the Hightower host under Daeron, the Lannisters from the west, Cregan's northmen marching south, the Velaryon fleet massing for the Gullet.
Where they stand. Castle Black and Winterfell.
Their story
Lord of Winterfell and Warden of the North while still a young man, Cregan Stark carries the North's old, unhurried gravity into a war fought mostly by people considerably more excitable than he is — the Wolf of the North, as the histories come to call him, keeps oaths the way his ancestors kept winter stores, methodically and without complaint about the cost.
His involvement in the Dance is deliberate and, by northern standards, expensive — the North does not typically involve itself deeply in southern succession squabbles, and Cregan's decision to commit troops and his own considerable personal authority to the black cause is a calculated wager rather than an impulsive one.
The Pact of Ice and Fire, the price he extracts for that commitment, is characteristic of the man: not gold, not immediate advantage, but a binding promise whose value only becomes clear once the war's dust settles and the North finds itself with leverage very few other regions of the realm still possess.
How it ends for them
The chronicle records no death for this soul — they are living when the tale leaves them, or their ending is a page the maesters have yet to turn.
Their chapters, book by book
Fire & Blood — The Dance of the Dragons 1 chapter that name them
Where the page and the screen part
Cregan Stark's role expands considerably in Fire & Blood's later chapters, where his northern host's arrival becomes decisive to the war's final resolution and his subsequent role in the postwar regency — material the show's current seasons have not yet reached, leaving the character comparatively undeveloped on screen relative to the book's fuller treatment of him as a decisive late-arriving power broker.
Their journey
Where the two tellings send them to the same place the road runs whole; where they part, the screen keeps the left and the books the right.