Addam Mallister

"My name is Addam of House Mallister. I am the Lord of Riverrun. I am the younger brother and heir of Lord Byron. I am the son of Willard Mallister, murdered by heathens of the Red God. I...witnessed my twin die. I murdered man trying to do his duty. I overthrew my rightful liege lord. I married a girl that hates me. What am I?"

- Addam to himself in a looking glass

Addam (471 AC - ) of the House Mallister is the current Lord of Riverrun and the younger brother to Lord Paramount Byron Mallister.

The Red Spring
Addam witnesses Byron's coronation as Lord of Seagard with his younger twin brother, Rodrick Mallister. Ryman Frey arrives at Seagard, formally inviting Byron to become Master of War for the Trident. Addam meets Ryman's daughter Talia Frey and quickly becomes infatuated, leading to him being teased by Byron and Rodrick for liking a Frey, no matter how pretty she is.

When Byron leaves for the Twins, Addam is left in charge of Seagard.

The Typhoon of Steel
Addam and Rodrick, due to their skill with the sword and military tactics, arrive at a meeting at Riverrun to discuss the plan for war against Arthur Lannister and his Kingdom of the Rock. Byron instructs Addam he will lead a small battalion to the Crag, hoping to draw the Lannister armies away from the passes in the Golden Tooth, where the real Frey advance will be. Before he leaves, Addam talks with Talia at a R'hllor religious function; Addam, believing in the Faith of the Seven, is a little unnerved. Talia wishes him good luck on the campaign.

Addam and Rodrick march along the coast, but are met by a force led by the Crag's castellan, Arton Hill. The hot-headed Rodrick challenges Arton to a duel for the castle, but Arton refuses, and a battle ensues. Arton leads a calvary charge which smashes Addam's host, and the Mallisters are forced to retreat from the Crag, their plan failing.

Addam and Rodrick regroup with the main Frey host outside of Riverrun. The army, led by Byron, marches into the Rock, where they are met by an outnumbered Lannister host led by Tybolt Lannister and Patrek Westerling. Despite their numerical superiority, the Frey army is beaten badly, and Rodrick is killed. Byron, Addam, and the remaining soldiers retreat back to Riverrun. Addam mourns Rodrick, and Byron blames Ryman for Rodrick's death.

The Lion's Dawn
Byron, supported by Arthur Lannister, begins a conspiracy to overthrow Ryman. Byron recruits an indecisive Addam, who doesn't want to hurt Talia's family. Talia arrives at Riverrun, where it is rumored she is to bed to Byron, much to Addam's jealously.

Byron maneuvers the remaining forces into allowing the Lannisters to encircle the city. The suspicious Ryman sends his Spymaster Artos Rivers to spy on Byron; Addam discovers this and informs Byron. On the night of Byron's coup, Byron plans to open to gate to the Lannister army, and sends Addam to deal with Artos. Addam discovers Artos had discovered Byron's plan, and went to inform Ryman. Addam tackles Artos into an alley, and is forced to kill him and throw his body into one of Riverrun's many streams. The coup then begins and the Lannisters take the castle, and Byron executes Ryman by hanging him. Talia is captured and imprisoned.

Hoping to smooth things over with the River lords, and reward Addam, Byron arranges a marriage between Addam and Talia. At a very tense wedding, the once friendly Talia refuses to acknowledge Addam, and during the bedding, Addam can't find it within himself to force himself upon her.

When Byron returns to Seagard, he gives Riverrun to Addam.