Hosteen Frey

Ser Hosteen Frey is a recurring character in the fifth and sixth seasons, debuting in "Elia, of Dorne".

Season 4
Hosteen Frey makes a minor appearance in Season 4, leading the 2,000 Frey soldiers marching towards Winterfell to secure the Boltons' rulership of the North.

Season 5
Hosteen makes his next appearance during the marriage of Ramsay Bolton and "Arya Stark" who is actually Jeyne Poole in disguise. Many of the northern lords in attendance refuse to sit near or even talk to Hosteen, much to his anger.

As the blizzard hits Winterfell and a string of murders occurs, tensions inside the castle nearly reach a breaking point. Hosteen suspects Theon of the murders, but he later realizes that the disloyal northeners are most likely behind the murders.

He angrily confronts Lord Wyman Manderly, who states he is not responsible for the murders, but he continues to insult the Freys. Hosteen attempts to kill Wyman, resulting in a brawl between Frey and Manderly forces. Roose Bolton breaks up the fight.

In order to prevent a battle within his own walls, Roose sends Hosteen and Wyman out of the castle to defeat Stannis Baratheon's army. Roose gives Hosteen a map of Stannis's forces, given to him by a traitorous informant in Stannis's camp.

Season 6
Hosteen and the Frey army arrive near Stannis's encampment at the Crofter's Village ahead of the Manderly forces. Due to his aggressiveness, lack of intelligence, and the map, Hosteen falls right into Stannis's trap: he marches his army onto a lake, believing it to be solid ground. Once Hosteen's army is on top of the lake, Stannis lights a weirwood on fire and unsheathes Lightbringer, temporarily blinding Hosteen and his forces, and signalling catapults to fire on the frozen lake. The lake collapses and most of Hosteen's forces are killed. Hosteen escapes and attempts to retreat back to Winterfell, only to be killed by the Manderly forces that were bringing up the rear.