Lord Roose Bolton is the Lord Paramount and Warden of the North, formerly a bannerman of House Stark. He is known for being ruthless and cruel, as well as ominously quiet and powerful. He is known as the leech lord because he regularly covers himself in leeches to keep himself healthy. He has a bastard son, Ramsay, who is even more infamous for cruelty and sadism than Roose himself. He suspects that Ramsay had poisoned his older, trueborn son, in order to secure the dreadfort for himself.
A Game of ThronesEdit
Roose serves as a bannerman to Robb during the War of the Five Kings. He marches his men on Tywin Lannister's men but suffers a defeat at their hands and retreats, losing a sizable portion of his forces but managing to scrap together the remaining troops. His other troops are held at Harrenhall.
A Clash of KingsEdit
Roose's men remain at Harrenhall. However, when Tywin Lannister vacates the castle, Arya Stark secretly liberates the men held captive, who proceeded to take over the castle. Arya goes on to be his cupbearer under the name Nan for a brief time. When Robb Stark declares himself King in the North, Roose pledges allegiance to him.
A Storm of SwordsEdit
Secretly, Roose plots with Tywin Lannister against his liege and executes a stunning betrayal during Edmure Tully's marriage and personally murders Robb Stark. Roose beomes Warden of the North, and the de jure lord of Winterfell, due to his bastard son's marriage to Jeyne Poole, who was disguised as Arya Stark.