Bolton (son of Roose)

"Please, Ramsay ... he's your brother!"

- Walda Bolton unsuccessfully attempts to plead for the life of her son.

A Newborn Bolton is a minor character in the sixth season. He was the son of Lord Roose Bolton and Lady Walda Bolton. He was killed shortly after his birth by his legitimized bastard half-brother, Ramsay Bolton.

Season 5
During a family dinner attended by Ramsay Bolton's betrothed, Lady Sansa Stark, Roose has Walda announce the news that she is pregnant, and that from the way she is carrying, Maester Wolkan expects it is a boy. Ramsay is visibly distressed by the news.

Season 6
Following the Battle of Winterfell, Sansa escapes from the castle with the aid of her childhood friend, Theon Greyjoy, whom Ramsay had previously captured and tortured into accepting a new identity as "Reek". Despite their victory over Stannis Baratheon, Roose is disappointed in his son's actions, and states that if he is unable to produce an heir, that responsibility may pass to his son by Walda. After the squad that Ramsay sends after them is wiped out, Roose expresses his disappointment once again, and is horrified by Ramsay's suggestion that they should attack Castle Black. It is then that Maester Wolkan announces that Walda has given birth to a healthy baby boy. When Ramsay goes to embrace Roose in congratulations, he suddenly stabs his father in the chest, killing him, and commands the Maester to bring Lady Walda and the baby to him in the courtyard.

Walda arrives to meet with "Lord Bolton", where Ramsay receives her, taking his newborn brother in his arms momentarily, before handing him back over to his mother. He then guides her into the kennels, where he says Lord Bolton is waiting for her, and locks the gate behind them, before proceeding to open the cages of his hounds one by one. Walda soon realizes what is happening, and demands to see Lord Bolton, at which point Ramsay announces; "I am Lord Bolton". Realizing her husband is dead, Walda begs to be allowed to leave and return to her grandfather in the The Riverlands, promising she will never return to Winterfell again, and reminds Ramsay that what he is about to do, he's about to do to his own brother. Ramsay replies that he prefers to be an only child, and sets the hounds on Walda and the baby, who tear them apart.

In the books
In the novels, it is mentioned Walda is pregnant in the last of Theon's POV chapters in the fifth novel, but she has not given birth yet. At the point the books reached, she and Roose are still alive.

After Roose tells Reek about his trueborn son Domeric's death, he comments that Ramsay will probably also kill any trueborn children that Walda gives birth to.