Lord of Hornwood
Ramsay Bolton is the illegitimate bastard son of Lord Roose Bolton. Originally named Ramsay Snow, he was known as the Bastard of Bolton and the Bastard of the Dreadfort. Ramsay considers himself a true Bolton despite his birth and is highly resentful of his baseborn status, referring to himself proudly as the trueborn scion of the Dreadfort and violently correcting those who refer to him otherwise.
Ramsay has a group of men-at-arms who stand high in his favor and follow him loyally. They are called the "Bastard Boys," though never within their or Ramsay's hearing, and are just as depraved as Ramsay. Ramsay's personal steed is named Blood.
He is the product of rape. His father, Roose Bolton, raped his mother under the swinging corpse of her husband whom he had just ordered hanged on a pretext. Ramsay probably also poisoned Roose's legitimate heir, at least Roose thinks so. Roose never fully abandons the child, and even provides for him, mostly from a distance. As a child, Ramsay has a friend that smells awful all the time, thus the name Reek . The Reek that Theon meets is inferred to be Ramsay, assuming the Reek personea.
It is Ramsay/Reek 's idea to burn the boys at the mill and pass them off as Bran and Rickon. He betrays Theon when he returns to Winterfell with an army posing as allies, only to cut down all the Ironmen, burn Winterfell, and take Theon hostage. Theon suffers torture at the hands of Ramsay, to the point that Theon forgets who he really is, and fully accepts being Reek , acquiring a status just a notch below Ramsay's dogs.
Ramsay's likes to hunt women, tracking them down, and then raping and killing them. He names his dogs after the ones who give good chase.
He later marries Jeyne Poole under the ruse that she is Arya Stark in order to lay claim to being lord of the north. In the final chapters of book five, Theon and Jeyne escape Ramsay and are delivered to Stannis, where Theon regains his sense of self as he is reuinited with his sister, who is a captive of Stannis.